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I for one welcome our supreme overloads, the megaforms... But in seriousness, I've been playing since the beginning of Red and Blue, I for one am interested. Looks Goodman.jpg, it will give some Pokemon different looks and types / moves, so it'll definitely come into play, competitively.
I'm interested to see megaevolutions of other Pokemon, they don't appear to follow any pattern, so who knows... Maybe MegaCharizard will overcome sneaky pebbles? Think of the possibilities anons.