Mewtwo

''Mewtwo was created by a scientist after years of horrific gene splicing and DNA engineering experiments. Even though the scientific power of humans created this POKEMON's body, they failed to endow Mewtwo with a compassionate heart.''

Mewtwo is Pokemon 151, at one time he was the strongest Pokemon in the world, and he is one of the few to earn a playable spot in the Smash Brothers series. His canonical power places him on equal ground with some big names in the Marvel Universe, because of his feats in the first Pokemon movie. He was terrible in Super Smash Bros Melee, but that's because he would insta-kill anybody if given his true power!