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Dynamax is completely misguided. They tried to give us another "Transformation" gimmick, without understanding what made Mega Evolution such a cool and popular idea. Each Mega was functionally its own unique character. Charizard X doesn't just look bigger and stronger; he has a new Type, new stats, and a new Ability to compliment the change. A Fire/Dragon with Tough Claws and great Physical Attack. GMax Charizard on the other hand is the same 'mon with a fat HP Bar. And the design isn't even physically real according to in-game lore (lmao).
Moreover, making each Mega its own character meant that competitive players could ban / suspect test them on an individual basis. Instead of banning the feature in its entirety, like with Dynamax. It sounds nice on paper that "Every Pokemon can use this feature", but giving everything in the game a nuclear arsenal to compensate for their weaknesses didn't exactly make the game "balanced". Unless you exclusively play in Doubles. Maybe.