Unburden (ability)

Unburden (Japanese: かるわざ Acrobatics) is an ability that boosts the speed stat if the Pokémon's held item is used or lost.

In Battle
Unburden doubles the Pokémon's Speed stat when the Pokémon's held item is lost. If there is no held item, to begin with, or if a held item is traded for another, Unburden will not be activated. This boost is lost if the Pokémon is switched out or gains a held item.

Outside of battle
Unburden has no effect outside of battle.