After Misty leaves that house near the beginning of the game you can go back to it. Inside should be Bill's dad, he will say something like 'my son told me about a Pokemon with a long tongue, can you show me that Pokemon'? If you have the Pokemon select it, if not get it. In return he will give you a stone, you can do this 5 times I think and each time he will ask for a different Pokemon and give you a different stone in return.
Go to first pier as soon as you enter Castelia City and talk to the scientist there. He will give you the choice between three stones. Choose the Fire Stone.
in pokemon black and white
You'll need to use a Fire Stone on it.
You go to Castelia City and go to one of the piers (I forget which one, but I think it's the first one.) There will be an old man there and when you talk to him he will ask you to pick one of the monkeys in your party and if you pick Pansear he will give you a Fire stone. If you've already done that, you can give a fire stone to a Pokemon on a different game like Diamond and transfer it.
You get a chimchar
Minccino-shiny stone,muna-moon stone,pansear-fire stone,pansage-leafstone,panpour-waterstone,cottonee-sun stone,petlil-sun stone, electrik-thunder stone,lampent-dusk stone
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