You can find grimer on route 17 in Pokemon heartgold.
route 16,route 17,route18,Celadon city and the safari zone.
Good luck! :)
Chat with our AI personalities
When your talking to the guy in front of the house there is water and the grimer and muk are in it.
In the Platinum it is 44, but I am not sure about Heartgold and Soulsilver.
By evolving Grimer
You find Grimer in the Fiery Path. They are rare is it may seem that they are not there but they are. Its worth the time getting Grimer then evolving it to Muk, because Muk is probably one of the stronger Poison type Pokemon that are in Emerald!
For Grimer to evolve, get him to level 38.