If used from the Bag, it changes a Pokémon's Ability from one of its standard Abilities to its other standard Ability. It can only be used outside of battle. It is consumed after use.
The Ability Capsule can only be used on a Pokémon that belongs to a species that has two standard Abilities. For example, it can be used to change a Pidgey's Ability from Keen Eye to Tangled Feet (or vice versa), but it cannot be used on a Pikachu (whose standard Ability is always Static). It also cannot be used to change a Pokémon to or from its species' Hidden Ability. The Ability Capsule also cannot change the Ability of Zygarde (between Aura Break and Power Construct) or Greninja (between Torrent and Battle Bond). It also cannot change the Ability of Rockruff to or from Own Tempo (but can change Rockruff's Ability between Keen Eye and Vital Spirit).
The Ability change is retained even if the Pokémon evolves, and the Ability slot provided by the Ability Capsule is maintained if the evolved form has a different standard Ability. For example, a Lillipup with the Ability Pickup evolves into a Herdier (which evolves into a Stoutland) with the Ability Sand Rush, but if Lillipup's Ability is changed to Vital Spirit with an Ability Capsule, it will have the Ability Intimidate after evolution.
Fling fails if the user is holding an Ability Capsule.
|A capsule that allows a Pokémon with two Abilities to switch between these Abilities when it is used.
||A capsule that allows a Pokémon to switch its current Ability to the other Ability its species can have.