Big Pecks

https://vignette.wikia.nocookie.net/pmysteryuniverse/images/d/dc/Big_Pecks.png/revision/latest?cb=20200124060006&format=original  is an Ability that prevents the Pokémon's Defense stat from lowering.

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