Muk at lvl 38
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For Grimer to evolve, get him to level 38.
Grimer will evolve to a Muk at Level 38.
it doesnt. But, you can evolve grimer to muk.
Grimer can evolve into muk starting at level 38. Grimer's evolution conditions are the same in SoulSilver as every other game so far.
Grimer evolves into Muk at level 38.