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.

Weak Armor Questions & Answers

What does Weak Armor do?
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.
How many Pokémon have Weak Armor?
23 Pokémon can have Weak Armor.
What Pokémon have Weak Armor?
Onix, Omanyte, Omastar, Kabuto, and Kabutops, and 18 more Pokémon can have Weak Armor — the full list is above.
When was Weak Armor introduced?
Weak Armor was introduced in Generation V.