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Whenever the wielder takes damage from a physical attack (not recoil from a move such as Flare Blitz), its Defense is lowered by one stage, and its Speed is raised by one stage. Weak Armor activates on each hit of a multi-hit move.
Kabutops and Omastar appreciate ways of boosting their Speed with the complex ban on Drizzle in effect, but the lowering of Defense, coupled with their weakness to priority moves, makes it a very risky tactic to try.
Found in Dream World