Grimer
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Grimer is a Pokémon introduced in Generation I (Kanto).
Grimer evolves into Muk when given an Evo Candy. Similarly, Alolan Form Grimer evolves into Alolan Form Muk when given an Evo Candy.
There is a chance for Muk to be reverted into Grimer when exposed to a Devolution Spray KC-MK1, Devolution Spray KC-MK2, or Devolution Spray KC-MK3.