|20||100%||May affect anyone adjacent to the user|
Adds the Grass type to the target, in addition to the target's original type(s). If it is used against a dual-type Pokémon, that Pokémon will have three types at once. If the target already has an additional type added to it by Trick-or-Treat, that type is replaced with the Grass type. Always hits, unless the target is in a semi-invulnerable turn. Fails if the target is already a Grass-type.