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It's because he's pushed out constantly in every fucking Gen as the best Pokémon ever, just like Pikachu.
Mewtwo sucked dick in competitive Smash Bros. Melee, so Nintendo decided it would make more sense to REMOVE HIM COMPLETELY and replace him with Fagcario, instead of just changing his moves or balancing him.
I don't hate him because of his design or the furry fanbase, he's just one of those Pokémon that is painfully shoehorned in to everything and it's fucking annoying.