Big Pecks

 is an Ability that doesn't allow the Pokémon's Defense stat to drop.

Effect
The Pokémon's Defense stat cannot be lowered. Mold Breaker bypasses.

Pokémon with

 * Pidgey
 * Pidgeotto
 * Pidgeot
 * Chatot
 * Pidove
 * Tranquill
 * Unfezant
 * Ducklett
 * Swanna
 * Vullaby
 * Mandibuzz
 * Fletchling