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Cool design topped off with insane stats and a damn good movepool.
STAB Acrobatics means a 165 BP move coming off a base 140 Attack stat. What's that? You've got a Steel/Rock/Electric type that resists Acrobatics? Think again, this fucker also has Earthquake to blow those resistances out of the water. If the opponent's Pokemon is tanky enough to live a blow? One good U-Turn out of there lets it break any Sturdies and lets Archeops skedaddle on out of there.
Sure, Defeatist sucks, but it really doesn't matter when you OHKO everything in front of you.