Multitype changes the form and type of a Pokémon with this Ability depending on the Plate attached.
Gastro Acid, Worry Seed, and Simple Beam fail if the target has the Ability Multitype. Role Play, Skill Swap, Entrainment, and Doodle fail if either Pokémon has Multitype. Multitype cannot be copied by Trace, Power of Alchemy, or Receiver. Multitype cannot be replaced by Mummy or Lingering Aroma, suppressed by Core Enforcer or Neutralizing Gas, or traded by Wandering Spirit.
The item-removing effects of Thief, Covet, Trick, Switcheroo, and Knock Off will not work on a Pokémon with Multitype, regardless of what item it is holding.
When a Pokémon transforms into Arceus, it becomes the same form and type as the target Arceus. If the transformed Pokémon is holding a Plate that is different from the target's held Plate, it then immediately changes to the form and type corresponding to that Plate; if it is not holding a Plate, it immediately changes to Normal Arceus (unless it transformed into Normal Arceus).
Generations V and VI
If a Pokémon transforms into Arceus, the Pokémon will now be in the same form as the target Arceus, regardless of its own held item.
Multitype no longer has an effect on items; instead, item-manipulating effects cannot affect Arceus if they would cause it to hold a Plate or take a Plate it already holds.
Multitype will also change Arceus's type and form if it holds a type-specific Z-Crystal.
If the user Terastallizes, the effects of Multitype will be nullified.
Outside of battle
Multitype has no effect outside of battle.