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half of OU falls under that category
specifically breloom, dragonite, lele, koko, fini, buzzwole, kartana, marowak, mimikyu, mega-metagross, both mega-charizards, pretty much all megas aside from zam and gyarados.
abilities are essential for pokemon, it's very unusual for a pokemon with a bad or useless ability to be good, only one I can think of are legendaries for obvious reasons, and weavile because it's the only well-designed ice type (I mean stat wise before people bitch and moan about heir bros looking better).
