The user switches held items with the target. If only one of them is holding an item, the item is moved to the other.
Trick fails if neither Pokémon has a held item, if the user is a wild Pokémon, if either Pokémon is holding Griseous Orb, if the target is behind a substitute, or if the target has Sticky Hold (even if it has no held item). It also fails if either Pokémon has Multitype.
In link battles, battle facilities, Secret Bases, and the Trainer House, items stolen will be returned at the end of the battle.
In Japanese Pokémon Ruby and Sapphire, Trick can exchange Mail, but causes the Trick Mail bug. In international releases of Pokémon Ruby and Sapphire, as well as all releases of subsequent games, Trick will fail if either Pokémon is holding Mail.
Generation V onwards
Trick no longer switches a Trainer's Pokémon's items permanently; however, items switched in wild battles are permanently switched.
Trick can now exchange a Griseous Orb as long as neither the user nor the target is Giratina. Trick fails if the user or the target is Arceus when either Pokémon holds a Plate (Multitype has no effect on Trick), if the user or the target is Genesect when either Pokémon holds a Drive, if the user or the target is holding a Mega Stone or a colored orb that could allow either Pokémon to undergo Mega Evolution or Primal Reversion, if either Pokémon is holding Mail or a Z-Crystal, or if the user or the target is Silvally and either Pokémon is holding a memory.
If powered up by a Psychium Z into Z-Trick, the user's Speed is raised two stages.
In Generation IV, despite being able to learn this move via Move Tutor, it will always fail when used by Arceus due to its Ability Multitype. In later generations, it can successfully use the move as long as neither Pokémon is holding a Plate.