Fire stone
Vulpix can evolve at any level since it evolves once you use a Fire Stone on it.
You give your Vulpix a fire stone and it will evolve into Ninetails
You have to have a firestone to evolve Vulpix :D
vulpix evolves into ninetails after you give it a fire stone. trust me, i have all Pokemon games for gbc, gba, and ds.
on MT.pure
It is suppose to evolve at the Level of 20,but if you want it to evolve later it can evolve anything after it is at Level 20.
It will evolve by level. Teddiursa will evolve into a Ursaring at level 30.
They evolve at level 36
It will evolve at level 36.
They evolve on level 40
it evolve on level on 64
if you dont let it evolve at the required level of level 20. itll try to evolve at every level following.