ninetails does not evolve but if you ment vulpix use firestone
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you have to use a fire stone in order to make vulpix evolve in to ninetails. it cant be leveled up to evolve.
You give your Vulpix a fire stone and it will evolve into Ninetails
With a Firestone you can evolve into a Eevee into a Flareon, A Vulpix into a Ninetails and a Growlithe into a Artacaine
Actually, in Leaf Green, I evolved my Vulpix to a Ninetails by using a fire stone. You can obtain one at Celadon City at the department store on level 4. The merchant guy has the stone for sale.
Get a vulpix from a friend's SoulSilver game (the GTS can help you here) and evolve the vulpix with a firestone