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You realize in the time it's taken for this discussion to get this far, you probably would have gotten a good Mewtwo already.
Only one way to find out... try it yourself and tell us what happens. I'm actually kinda curious on what will happen. :sthough I don't think anything different will happen, lol
There's no need to waste all the time even if it is possible, all Pokemon that can't evolve now have at least three perfect IV's anyway, and it's not hard to get good/great ones for the rest.
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