In your heart
Grimer can evolve into muk starting at level 38. Grimer's evolution conditions are the same in SoulSilver as every other game so far.
In the Platinum it is 44, but I am not sure about Heartgold and Soulsilver.
Yes, Grimer can be caught in Pokemon Fire Red.
Grimer does not have a pre-evolution. The Pokemon before Grimer in the PokeDex is Dewgong, evolution of Seel.
grimer is in route 212
For Grimer to evolve, get him to level 38.
No.
Grimer is #88 in the national pokedex, and it is a Poison type Pokemon.
Grimer evolves into Muk at level 38.
Poison type.
It is grimer
fire cave