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Don't worry about it, I've seen people take out Mewtwo with a Drifblim with horrible stats in competitive play. If you're determined enough you can win anything.
That doesnt really answer his question on what the actually are, but the FAQ at the top of the page does (AKA he should go there :)).
And mewtwo defeated by driblim? I know EVing is important but i can see that happenening lol