Generation V Ability

Weak Armor

Raises Speed and lowers Defense by one stage each upon being hit by a physical move.

Weak Armor Effect

Whenever a physical move hits this Pokémon, its Speed rises one stage and its Defense falls one stage. This ability triggers on every hit of a multiple-hit move.

“The Pokémon's Defense stat is lowered when it takes damage from physical moves, but its Speed stat is sharply boosted.”

Weak Armor Data

Introduced
Generation V
Pokémon
23
In short
Raises Speed and lowers Defense by one stage each upon being hit by a physical move.

Pokémon With Weak Armor

23 Pokémon can have Weak Armor.