Its available in Castelia City, and the Desert Resort. There will be a scientist it will ask witch Pokemon you have answer pansear
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With a Firestone you can evolve into a Eevee into a Flareon, A Vulpix into a Ninetails and a Growlithe into a Artacaine
firestones are for Pokemon who only are fire types
Pokemon such as eevee, growlithe, and vulpix.
One place you can get it is in the underground
there is a firestone in fiery pass