Benefactor

The Benefactor is a mysterious character who helps the player during the start of the game. It is likely that since Mew was sent to the player by this character, Nora's Celebi and Damian's Shaymin were also sent by he/she. However, this theory has not yet been proven. Also, while the Benefactor is talking with a Gengar background, it is unlikely that it is a Gengar because during this time, there was a Gengar eating the player's memories.