You must be more clear on what Pokémon expansion you are trying to get a Firestone on. Most games come with a strategy guide to help you through out the game.
how should i no
A fire stone is used on certain Pokemon to make them evolve. The Pokemon that evolve with a fire stone are: ~Evee ~Vulpix ~Growlithe
Pansear uses a fire stone to evolve into Simisear.
EEVEE EVOLVES from FIRE STONE into FLAREON
Fire stone
A total of three Pokemon evolve using the Fire Stone: Vulpix, Eevee, and Growlithe.
pansear the fire monkey pokemon
You get a chimchar
no it does not evolve with a fire stone.
Fire stone evolves Pansear into Simisear.
You get the fire stone on the first dock of castelia city.
Well, this may not be helpful, but Fire stones evolve some fire Pokemon... Sun stones also evolve fire Pokemon, (Fire stone, Thunder stone and Water stone also evolve "Eevee", the Pokemon you get after completing sinnoh dex.