Lucky. I've yet to get a Grimer, or even a Muk. You'd think I'd run across one living in the city.
Yeah, fire types are really rare for me to come across. They set it up to where certain locations specialize in different Pokemon. San Francisco is mostly water types, so I pretty much have every water Pokemon right now. I've only ever hatched fire types, or came across them using incense. You kinda' have to go out of your way for certain Pokemon. I've gotten so obsessed with it, I even made a Facebook group for my area for people to converse and plan outings in, people often post where exactly to find certain Pokemon. There are groups/pages on FB for a lot of local areas, so you could maybe search a group/page for your area. It's what I did before I made my own.