Bowser King
Have It Your Way
Again, the game has stated that pokemon are weakened when confined in pokeballs and in all off the games, the legendaries never really show all there true powers because once you catch them there confined.If that is the case then only the games are canon and the only things Mewtwo can do is shotting random beams and lights. Damaging lights, but still nothing Samus has not faced before.
I'm pretty sure professor rowan said that on spear pillar when he tells you to catch dialga.
Plus, even if we go by in-game alone, mewtwo can do a lot more then "random beams and lights". He can confuse his enemies, put them to sleep, disable the moves/weapons, recover, protect him self, boost his attack/defense/speed, predict the future, cause a blizzard or thunderstorm
Actually, just look at this and see how he can use each of his move. He isn't limited in options by any mean.
EDIT: .....they only do the dubbing, the people who actually make the show aren't 4kids.
-Bowser King