I take back what I said, this might get fun. Lucas and Mewtwo being different than Ness and Lucario isn't an opinion. They Are different, that's a fact. Lucario only shares one move with Mewtwo (Neutral-B) and even that isn't entirely the same. His smash attacks are similar too I guess. Lucas shares two moves with Ness. Down-B and F-Smash. Up-B is a bit similar though.