To get a Fire Stone you'll have to get to Kanto, after beating the Elite Four. Then you go to Bill's house north of Cerulean and talk to his grandfather. He'll ask for several Pokemon he wants you to show him, and after showing a Vulpix, you get your Fire Stone.
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Vulpix cannot evolve by leveling up. You will need a firestone so that it can evolve to become Ninetales.
With a Firestone you can evolve into a Eevee into a Flareon, A Vulpix into a Ninetails and a Growlithe into a Artacaine
Pokemon such as eevee, growlithe, and vulpix.
firestones are for Pokemon who only are fire types
One place you can get it is in the underground