Choice Specs are one of the items that can be held by Pokémon. It can be obtained as a tier 3 special drop. It is a possible drop from legendary and ultimate boss Pokémon, and from wild Delphox.
Choice Specs raise the Special Attack stat of the Pokémon holding them by 1.5×, but restrict the holder to using one move until it is recalled from battle. If the move that the Pokémon is locked into runs out of PP or is otherwise prevented from being used, the Pokémon will start using Struggle.