You can get fire stones from going underground and mining. It may take a little while but you could get lucky. Also, there's one in the Fuego Ironworks.
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The Market in Celadon City.
one of the only and the best fire pokemon you get on pokemon crystal is Growlithe, because when you evolve it with a fire stone it evolves into Arcanine, which is pretty tough. but remember to evolve it after growlithe turns to level 34, after it learns flame wheel. and also remember that you cant evolve it without a fire stone! :)
Get school boy Alan's number (he's on route 36).
They don`t have a certain level you need a fire stone
You will need to use a Fire Stone on Growlithe in order for it to evolve, it will evolve into Arcanine.