Weak Armor

When a Pokémon with Weak Armor is hit by a physical move, its Defense drops one stage, but its Speed increases by one stage. Stats can be raised to a maximum of +6 stages each, or lowered to a minimum of -6 stages each.

Game descriptions

Black, White, Black 2, White 2:Physical attacks lower Defense and raise Speed.
X, Y, O.Ruby, A.Sapphire:Physical attacks lower its Defense stat and raise its Speed stat.
Sun, Moon, Ultra Sun, Ultra Moon:Physical attacks to the Pokémon lower its Defense stat but sharply raise its Speed stat.
Sword, Shield, B.Diamond, S.Pearl:Physical attacks to the Pokémon lower its Defense stat but sharply raise its Speed stat.
Scarlet, Violet:The Pokémon’s Defense stat is lowered when it takes damage from physical moves, but its Speed stat is sharply boosted.

Weak Armor

Game descriptions

Pokémon with this ability (24)