You can find a Fire Stone by talking to man on the pier south of Castelia City's entrance. You can also find one Northwest of Psychic Gaven in the Desert Resort. Another method is by walking into dust clouds inside caves (though you won't always find a fire stone in these clouds).
you can find a fire stone in the desert resort on the far side in a pokeball or you can get one from the scientist in castelia city based on which elemental monkey you got. hope this helps!
in pokemon black and white
it evolves with a fire stone not by leveling up
You get a chimchar
to evolve pansear you need to give it a fire stone
you need to give it a fire stone. he is a fire type Pokemon so waterb will hert him. his
pansear
Fire stone evolves Pansear into Simisear.
You give it a fire stone
in pokemon black and white
in white two, you can find it in the desert resort
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 by leveling up
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!
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