FusionDex

Mansea swims around underwater, aggressively attacking any Pokémon that gets in its way with its head and tail. The pummeling only stops because Mansea must regularly return to the surface to breathe.

By cleverly flicking the fins on its back side to side, it moves in any direction while facing forward. When it starts shaking and its nasal breathing turns rough, it's a sure sign of anger.