Big Pecks

 is a Pokémon ability introduced in the fifth generation. It prevents the Defense stat from lowering.

Description
Big Pecks prevents opposing Pokémon from lowering the defense stage of the Pokémon with this ability. The user can still lower their own defense if they use moves that lower their own defense stages. Moves that swap stats like Guard Swap are unaffected by Pig Pecks. Mold Breaker can ignore the effects of this ability

Pokémon with Ability

 * Pidove
 * Tranquill
 * Unfezant
 * Ducklett
 * Swanna
 * Vullaby
 * Mandibuzz
 * Fletchling

As a Hidden Ability

 * Pidgey
 * Pidgeotto
 * Pidgeot
 * Chatot

Trivia

 * All Pokémon that can have this ability are Flying type Pokémon.