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Pure Power doubles the wielder's Attack stat.
Obviously an amazing ability, but only one Pokemon has it. Even though Medicham's base Attack is only 60 to begin with, Pure Power raises it to barely behind Deoxys-A, meaning Medicham should not be taken lightly at all. It also has a ridiculous STAB move to use in Hi Jump Kick. Medicham is frail though, and without an effective priority move cannot function effectively in the higher tiers, though its power is potent in the lower tiers.
Found in Dream World