mewtwo was okay. But he was voted one of the worst characters in the game. So they had to redesign his moves. And since mewtwo never did show up in another movie, they had to use the most recent popular psychic pokemon, which in this case, was Lucario.
DkLoVe
"Lucario, I hate Lucario he took Mew-two's spot"
I hated mewtwo... Badly
Aand... wasnt this about Rapunzel? now is about Smash bros blah
Maxas
Mewtwo rules and ... So what if it was about Rapunzel now its about SSBB