Gluttony

 is a Pokémon ability introduced in the fourth generation. It encourages early use of a berry.

Description
Pokémon with Gluttony eat their held berry at 50% or lower instead of at 25% or lower. It has no effect on the Oran Berry or berries that trigger off other effects. The berries activated by gluttony include the following
 * Liechi
 * Ganlon
 * Salac
 * Petaya
 * Apicot
 * Lansat
 * Micle
 * Custap
 * Figy (Gen VII)
 * Wiki (Gen VII)
 * Mago (Gen VII)
 * Aguav (Gen VII)
 * Iapapa (Gen VII)

Pokémon Mystery Dungeon series
Gluttony causes the Belly of the Pokémon with this Ability to empty out quicker than normal. However, it sometimes also negates Grimy Food's side effect, similarly to Survivalist IQ skill.

Pokémon with Ability

 * Rattata (Alola Form)
 * Raticate (Alola Form)
 * Grimer (Alola Form)
 * Muk (Alola Form)
 * Shuckle
 * Zigzagoon
 * Linoone
 * Pansage
 * Simisage
 * Pansear
 * Simisear
 * Panpour
 * Simipour
 * Heatmor

As a Hidden Ability

 * Bellsprout
 * Weepinbell
 * Victreebel
 * Snorlax
 * Gulpin
 * Swalot
 * Spoink
 * Grumpig
 * Munchlax