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Regigigas: Mega Evolve and lose its' Slow Start. Give it a new ability that does something else that doesn't fuck it over (like Truant) or make it super Uber (Huge Power) Maybe give it a reverse Slow Start that lowers his Atk and Speed every turn, I just want to use my favorite Pokemon, gamefreak! Is that so much to ask?
Mewtwo doesn't need a Mega Evolution, let alone 2. He was fine the way he was.