Pokémon X and Pokémon Y

Which...almost never applies to pokemon

Shaymin, Giratina, Black/White Kyurem, all have multiple forms that are significantly different in size, with the larger one having the higher att or Sp. Att.
The rest of the pokemon don't have significant changes in size (Heck, even giratina is pushing *significant*)

Maybe you have an argument for darmitian in that he switches his high att for high SP.Att, in his smaller form, but thats about it.

Well I was talking about Mewtwo.
Only pointed it out cause it sounds illogical...