You answered your question in your question. You find Grimer in the Fiery Path.
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There is like a two percent chance of find grimer on the Fiery Path near lavaridge town if you use sweet scent it ups your chances
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!
It's very rare but in fiery path. Hope this helps :D
you can't catch muk in emerald but you can catch grimer in the fiery path and get him to level 30 and he will evolve in to muk okay
You can find a Fire Stone in the Fiery Path after you get the HM for Strength.