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Whenever an attack by an opposing Pokemon or an ability from an opposing Pokemon causes a stat stage of the wielder to be reduced, its Attack is raised by 2 stages. Defiant triggers once for each different stat stage reduced.
Braviary and Primeape have access to Superpower and Close Combat respectively, but Defiant isn't triggered by self-inflicted stat drops, so this makes the entire ability slightly worse. However, it is still useful for preventing the effects of Intimidate for Bisharp, Braviary, and Primeape.
Found in Dream World