Harvest

https://vignette.wikia.nocookie.net/pmysteryuniverse/images/4/4d/Harvest.png/revision/latest?cb=20200124060256&format=original Harvest is an Ability that doubles the effect of berries when they are eaten.

Effect
When a Pokémon with Harvest eats a berry, it counts as two berries. As a result, the effect of eating a berry is doubled. This includes the berry's original effect as well as the effect on Belly.

Pokémon with Harvest

 * Exeggcute
 * Exeggutor
 * Alolan Exeggutor
 * Tropius
 * Phantump
 * Trevenant