Manaphy

Manaphy is a Water-type Legendary Pokémon that first appeared in Pokémon Ruby and Sapphire. Through breeding, it can make Phione (who, oddly enough, is unable to evolve into Manaphy). In Super Smash Bros. Brawl, it can be spawned from a Poké Ball and uses Heart Swap, its signature move, which temporarily swaps the body of two players. The players' damage and stocks carry between stocks, and self-destruction causes the dying player to lose a life and not the opponent.