Talk to Alan the Schoolboy on route 36. Battle him and get his number. He is the one with the fire stones.
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Get schoolboy Alan's phone number on route 36
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