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this pokemon isnt as easy to use as the other megas because you've got to make a free turn for it to SD before it becomes of any use(encorers like wobbuffet and whimsicott its best friends), but once it gets going there's not a lot that can stop it. to give you some examples of its power, if you manage to get an SD off it can:
ohko genesect with quickattack
ohko ferrothorn with return
ohko gliscor with return
ohko some rotom-w sets
to me it seems it would fit right at home in ubers