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Hyper voice is the most powerful STAB move mega gardevoir gets because it's ability multiplies normal type moves base power by 1.3 then turns them into fairy type.
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Oh right. I forgot it has pixelate or whatev the ability is. It's one of the mega evos I don't normally deal with much. You seem to know what you're doing. Just throw any sp. Atk move that gives more type advantage.