Suggested by Sonic The Yellow Devil is a pretty tricky villain to fight. He can regenerate to a good degree and his attacks do deal a lot of damage. Ditto on his own is fairly powerless but we have seen him copy very powerful abilities over the years. While Ditto is only able to copy the attacks/defense of a Pokemon and not their overall stamina/health, that will more than suffice here. Almost any of the Pokemon that Ditto has transformed into would be able to easily clear a victory here. A few good energy blasts will take the Devil out of this one. Ditto wins.