Later, it is revealed that he is an advanced blob of cheese modeled to look like that of a mutant rat. He first appeared in Bob The Builder's special game Can We Fix It?. In this game, Pikachu appeared as the 4th boss of the game, with Mario appearing next in line. Mario beat up Pikachu one day when Pikachu was picking berries, so they are actually mortal foes.
- Ash's Pikachu
- Pika the Creepy Pikachu