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Mamoswine has a passable Speed stat helped further by Ice Shard, and hits like a truck with Earthquake and Icicle Crash coming off its base 130 Attack. Access to Stone Edge, Superpower, Freeze-Dry, and Stealth Rock gives it very good coverage. It skimps on the defensive stats to put extra points into HP and, to some extent, Speed, giving it a stat spread befitting of a mammoth.