Forest's Curse adds the Grass type to the target, in addition to the Pokémon's original type(s). Forest's Curse will fail if the target is already Grass-type. 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. This additional type can be copied by Reflect Type.
Bold indicates a Pokémon gains STAB from this move. Italics indicates a Pokémon whose Evolution or alternate form receives STAB from this move. A dash (−) indicates a Pokémon cannot learn the move by the designated method. An empty cell indicates a Pokémon that is unavailable in that game/generation.
Phantump's eyes shine, and a ring of the same color shoots out of their eyes and hits the ground. The ground grows purple and purple vines grow out from it to constrict the opponent.
If a Dragon/Ice-type Pokémon is affected by Forest's Curse, it becomes weak to 10 types, the most of any possible type combination.
If a Bug/Flying-type Pokémon is affected by Forest's Curse, it becomes doubly weak to the most possible types, with four double weaknesses (Rock, Fire, Ice, and Flying).
If a Bug/Steel-type Pokémon is affected by Forest's Curse, then Skill Swap is used to acquire the Ability Fluffy, it becomes 16× weak to Fire-type moves.