Gluttony is an ability in the Pokémon series that affects how a Pokémon uses its held berries. Specifically, Gluttony allows a Pokémon to consume berries at a higher HP threshold than normal. Typically, most berries that restore HP or have other effects are consumed when a Pokémon’s HP drops to 50% or lower. However, a Pokémon with Gluttony will consume these berries when its HP drops to 75% or lower, giving it an earlier and potentially more strategic usage during battles.