Use a fire stone on it. (You can get these from the Pokeathlon on tuesdays for 3000 points or elsewhere if you don't have one)
you need to give vulpix a fire stone
Vulpix cannot evolve by leveling up. You will need a firestone so that it can evolve to become Ninetales.
Vulpix, Growlithe, and Eevee.
Okay, you need to use a fire stone on it, but remember this carefully: It will only work on a female Vulpix, not a male Vulpix.
In soul sliver Vulpix does not evolve by level it only evolves by a fire stone
Any time you like, as long as you use a fire stone!
You can't catch vulpix in Heart Gold, though you can catch it in Soul Silver. On the small route 37, Below Ecruteak City, you can find: ~Heart Gold = growlithe ~Soul Silver = vulpix (they both evolve using a fire stone)
you have to use a fire stone in order to make vulpix evolve in to ninetails. it cant be leveled up to evolve.
fire stone
Soul Silver: route 36 Heart Gold: trade with Soul Silver
Most Pokemon who needs stones to evolve can't learn any more attacks by leveling up after they have evolved. Therefore you should make sure your Vulpix already have god moves before you evolve it.
You need to give it a Fire Stone.