Use a Pokeradar Within Route 212.(Route 212 is west to Pastoria City)
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Go to Route 212.
no you have to migrate it from either Sapphire or ruby version hope i helped
Grimer (sometimes wrongly spelled as Grimmer) is a poison type of Pokémon. You can catch one in Pokémon Pearl by using the Poke radar on route 212.
No, they are there so you can catch them :)
you can catch grimer in celadon city by either fishing or surfing. it says so on Serebii.net