Castle Moat (Ability)
When a Pokémon with Castle is hit by an Water-type move, its Special Defense is increased by one stage, and the move will have no effect on that Pokémon.
Outside of battle
Castle Moat has no effect outside of battle.
Pokémon with Castle Moat
This ability was once the signature Ability of Mega Magcargo, however it has been replaced with Vaporization as of Insurgence 1.2. As a result, there are no longer any Pokémon that possess this ability.