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Ability Capsule
From Pixelmon Wiki
An Ability Capsule is an item that can be used on a Pokémon to switch between its two normal Abilities. It cannot be used if the Pokémon has its hidden Ability or does not have two normal Abilities, and cannot be used to change a Pokémon's Ability into its hidden Ability. An Ability Capsule will disappear upon being used successfully. It can be obtained as a tier 3 special drop. It is a possible drop from legendary and ultimate boss Pokémon.
