When held by a Pokémon, it boosts the Pokémon's Special Attack by 50%, but only allows the use of the first move selected. This effect resets when the holder is withdrawn.
In Pokémon Diamond and Pearl, due to a glitch, if a Pokémon uses U-turn and switches into a Pokémon holding Choice Specs that also knows U-turn, that Pokémon will be locked into U-turn. This was fixed in subsequent games.
Generation V to VI
From Generation V onward, if a Pokémon is already locked into a move due to held Choice Specs, if the held Choice Specs is removed while its effect is negated, the Pokémon will be affected by the Choice item lock glitch.
If a Pokémon holding Choice Specs uses a move other than the one it's locked into (such as through Instruct or Dancer), the move will fail and no PP will be deducted.
Dynamax Pokémon are unaffected by Choice Specs (both the move-lock effect and the stat boost). If a Pokémon is locked into a move due to Choice Specs and then Dynamaxes, when the Dynamax ends, the Pokémon once again can only use the move it was already locked into.
||An item to be held by a Pokémon. These distinctive glasses boost Sp. Atk, but allow only one kind of move to be used.
||An item to be held by a Pokémon. These distinctive glasses boost Sp. Atk but allow the use of only one of its moves.
|An item to be held by a Pokémon. These curious glasses boost Sp. Atk but only allow the use of one move.
||An item to be held by a Pokémon. These curious glasses boost the holder's Sp. Atk but only allow the use of a single move.