A Mega Stone is a type of held item that allows Pokémon to Mega Evolve.
Mechanics
During battle, the player can use their Key Stone-activating item, the Mega Ring to Mega Evolve a Pokémon before it attacks if it is holding the correct Mega Stone. Mega Stones only affect Pokémon during battles, and Pokémon will revert back to their basic form once the battle has ended or upon fainting. All Pokémon that can undergo Mega Evolution have an equivalent Mega Stone that is named after them, except for Rayquaza, which instead needs to know the move Dragon Ascent to Mega Evolve.
Mega Stones cannot be transferred to or from the correct holder during battle: Thief and Covet do not take the Mega Stone, Knock Off does not remove the Mega Stone, Trick and Switcheroo fail, Fling and Bestow fail, and Symbiosis does not activate. Embargo and Magic Room also cannot prevent the use of Mega Stones to Mega Evolve Pokémon. Mega Stones are not consumed upon use, but only one Pokémon can Mega Evolve per battle.
Availability
Mega Stones can be found numerous ways throughout the player's journey. Mega Stones are also sometimes found on the ground as a hidden item. Unlike the official games, they do not sparkle. Some can only being obtained through certain requirements like defeating a Gym Leader or collecting certain amounts of Flags from Friend Safaris.
Certain Mega Stones available during Mystery Gifts are removed as new Mystery Gifts are made available. These Mega Stones will become available to all players in-game during future updates. Additionally, the starter Mega Stones found inside of the Perfection Base change depending on whether or not the player is playing the game on Purity Mode. Those that are not playing on Purity Mode will be unable to acquire Blastoisinite, Charizardite Y, and Venusaurite without trading with another player.
List of Mega Stones
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Audino to Mega Evolve into Mega Audino when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Audino hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Altaria to Mega Evolve into Mega Altaria when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Altaria hold it, and this stone will enable it to Mega Evolve.
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Price: 15,000
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Cannot be sold
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Effect:
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Allows Ampharos to Mega Evolve into Mega Ampharos when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Ampharos hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Beedril to Mega Evolve into Mega Beedril when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Beedril hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Blastoise to Mega Evolve into Mega Blastoise when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Blastoise hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Cacturne to Mega Evolve into Mega Cacturne when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Cacturne hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Charizard to Mega Evolve into Mega Charizard Y when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Charizard hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Delta Bisharp to Mega Evolve into Mega Delta Bisharp when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Delta Bisharp hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Delta Blastoise to Mega Evolve into Mega Delta Blastoise when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Delta Blastoise hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Delta Charizard to Mega Evolve into Mega Delta Charizard when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Delta Charizard hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Delta Froslass to Mega Evolve into Mega Delta Froslass when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Delta Froslass hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Delta Gallade to Mega Evolve into Mega Delta Gallade when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Delta Gallade hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Delta Gardevoir to Mega Evolve into Mega Delta Gardevoir when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Delta Gardevoir hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Delta Glalie to Mega Evolve into Mega Delta Glalie when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Delta Glalie hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Delta Pidgeot to Mega Evolve into Mega Delta Pidgeot when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Delta Pidgeot hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Delta Scizor to Mega Evolve into Mega Delta Scizor when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Delta Scizor hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Delta Sunflora to Mega Evolve into Mega Delta Sunflora when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Delta Sunflora hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Delta Typhlosion to Mega Evolve into Mega Delta Typhlosion when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Delta Typhlosion hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Delta Venusaur to Mega Evolve into Mega Delta Venusaur when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Delta Venusaur hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Diancie to Mega Evolve into Mega Diancie when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Diancie hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Donphan to Mega Evolve into Mega Donphan when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Donphan hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Eevee to Mega Evolve into Mega Eevee when held during battle.
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Secondary effect:
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If held by Eevee, it prevents evolution.
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Description
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One variety of the mysterious Mega Stones. Have Eevee hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Feraligatr to Mega Evolve into Mega Feraligatr when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Feraligatr hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Flygon to Mega Evolve into Mega Flygon when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Flygon hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Garchomp to Mega Evolve into Mega Garchomp when held during battle.
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Locations
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Found near the end of Route 14. (Requires Tesseract, Surf, and Heart Swap)
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Description
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One of the various Mega Stones. Have Garchomp hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Gengar to Mega Evolve into Mega Gengar when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Gengar hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Girafarig to Mega Evolve into Mega Girafarig when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Girafarig hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Gothitelle to Mega Evolve into Mega Gothitelle when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Gothitelle hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Heracross to Mega Evolve into Mega Heracross when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Heracross hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Latias to Mega Evolve into Mega Latias when held during battle.
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Locations
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Mist Island hidden behind a treeon the left side of the forest. (requires Rock Climb)
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Description
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One variety of the mysterious Mega Stones. Have Latias hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Latios to Mega Evolve into Mega Latios when held during battle.
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Locations
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Mist Island on the right side of the forest.(requires Rock Climb)
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Description
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One variety of the mysterious Mega Stones. Have Latios hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Marowak to Mega Evolve into Mega Marowak when held during battle.
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Locations
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Speak to the guitarist outside of a house in Selene City while Marowak is in the player's party and then defeat him in a battle.
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Description
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One variety of the mysterious Mega Stones. Have Marowak hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Mawile to Mega Evolve into Mega Mawile when held during battle.
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Locations
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Hidden on the eastern most wind vane in Nasca Town
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Description
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One variety of the mysterious Mega Stones. Have Mawile hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Metagross to Mega Evolve into Mega Metagross when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Metagross hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Milotic to Mega Evolve into Mega Milotic when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Milotic hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Pidgeot to Mega Evolve into Mega Pidgeot when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Pidgeot hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Reuniclus to Mega Evolve into Mega Reuniclus when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Reuniclus hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Sableye to Mega Evolve into Mega Sableye when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Sableye hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Salamence to Mega Evolve into Mega Salamence when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Salamence hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Shiftry to Mega Evolve into Mega Shiftry when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Shiftry hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Spiritomb to Mega Evolve into Mega Spiritomb when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Spiritomb hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Slowbro to Mega Evolve into Mega Slowbro when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Slowbro hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Stunfisk to Mega Evolve into Mega Stunfisk when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Stunfisk hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Typhlosion to Mega Evolve into Mega Typhlosion when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Typhlosion hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Tyranitar to Mega Evolve into Mega Tyranitar when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Tyranitar hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Venusaur to Mega Evolve into Mega Venusaur when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Venusaur hold it, and this stone will enable it to Mega Evolve.
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Cannot be bought
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Cannot be sold
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Effect:
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Allows Zoroark to Mega Evolve into Mega Zoroark when held during battle.
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Description
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One variety of the mysterious Mega Stones. Have Zoroark hold it, and this stone will enable it to Mega Evolve.
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Trivia
- The design of the Mega Stones appear to be based on a common pattern found in the glass marble called a toothpaste marble.