One place I know to get a fire stone is to go to castelia city, then in the first dock, port thing, there should be a guy who looks like a scientist. Talk to him and he will ask you which Pokemon you picked. (Panpour, pansage, or pansear) You can lie and say you picked pansear and he will give you a Firestone in hopes you will evolve that Pokemon. Hoped that helped!
Pansear uses a fire stone to evolve into Simisear.
pansear the fire monkey pokemon
You get the fire stone on the first dock of castelia city.
in pokemon black and white
In the Desert Resort
Vulpix, Growlithe, and Eevee.
You can buy them for P10,000 at Black City if you have enough people there.
Petilil will evolve with a sun stone, pansage with a leaf stone, panpour with a water stone, and pansear will evolve with a fire stone.
it is in the desert near relic castle
Pansear evolves by Fire Stone into Simisear.
It evolves with a Fire Stone, not a certain level.
The same as any game, use a fire stone