Unlock Sweet Tooth from Twisted Metal: Black:
Use a completed save game from Twisted Metal: Black on your memory card to start the game. This will make Sweet Tooth available as Agamo's 4th Outfit.

Special Attack:
In order to do this in the game there will be a red flashing square under the health bar. Push triangle + Circle or Square + X.

Back flip kick with Ultra V(Charachter):
In Battle push Circle, Circle, Circle,Triangle