You can go to the Scientist assistant and answer his question with Pansear and he'll give you a Fire Stone. You can go to certain caves with dust clouds in them, such as Wellspring Cave, Chargestone Cave, Mistralton Cave, Twist Mountain, Challenger's Cave, Victory Road, and Giant Chasm. You can also find it in Desert Resort.
in pokemon black and white
Pansear evolves by Fire Stone into Simisear.
it is in the desert near relic castle
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.
Pansear uses a fire stone to evolve into Simisear.
Castelia city just as you go into it after the bridge from Pinwheel Forest
So far (although I have completed White not yet Black) all I know are Pansage (Leaf Stone), Pansear (Fire Stone) and Panpour (Water Stone). Sorry if this isn't as helpful as you hoped!
Fire stone evolves Pansear into Simisear.
pansear
You get the fire stone on the first dock of castelia city.
pansear the fire monkey pokemon
i hear u need to go around and ask people