The Yin Yang Pokemon
When this Pokemon changes forms, it can only regain the memories that occured while Yiyare was in the form it's currently in.
Type: Dark/Fairy
Ability: Dissociative (Changes forms every two turns.)
Solemn Form: High Def/SpDef/Hp
Jovial Form: High Atk/SpAtk/Spd
Signature Move: Self Therapy (Heals good amount of Hp and boosts all stats a bit.)