In-battle effect items
These items provide various benefits to the holder in battle.
These items affect experience or EV gain.
Incenses are used for breeding. Certain incenses also give benefits to the holder while in battle.
Gems are single-use held items that boost the damage of a move of their corresponding type by 1.3×.
A Plate is a held item that raises the power of the holder's corresponding-type moves by 20%. When held by Arceus, its typing and its signature move Judgment become the type of the Plate, and any corresponding-type moves, including Judgment itself, receive the power boost.
A Drive is a held item that can be held by Genesect to allow its signature move Techno Blast to become the type of the Drive.
A Memory Drive is a type of held item to work with the Ability RKS System to change the types of Silvally and its Multi-Attack.
A Z-Crystal is an held item required to use Z-Moves (stronger moves that can be used only 1 time in a battle).
All Crystals can be dropped from Totem Pokémon, and some even from Beastloots.
Pokémon Unique Z-Crystals
A type of Z-Crystal that only work if held by a specific Pokémon specie.