You can get it in Vermillion City in the house that is next to the Pokemon Center.
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If you have Fire Red in your DS, go to the Old Chateu.
If you mean the old version, Pokemon Red, and not Pokemon Firered, then the only place that I can think of that have tons of fire Pokemon is the mansion on Cinnabar island. Go inside and walk around. You should find a lot of Ponyta and Vulpix, if you're playing Pokemon Blue, but if you're playing Pokemon Red, you'll more than likely find Ponyta and probably Growlithe. I'm not sure if you can find Vulpix in Pokemon Red or not. But, that's where you will find a lot of GOOD fire Pokemon. And, of course, Moltres is hidden away in Victory Road.
No there is not.
you can not find him not 1 persent
You can't find a Vulpix in Pokemon FireRed version. That pokemon is version-exclusive to Pokemon LeafGreen.