You can buy it from one of the Kecleon stores in the dungeons. They're hard to find, though.
Mystfing Forest - Kelcon
Well you do need a fire stone, when you get a fire stone give it to your vulpix. after that go to that place where you evolve your Pokemon and your vulpix should evolve.
Yes you can you can find stones in dungeons or get them from rescue missions.
you need a fire stone then you go to luminous spring and evolve
find a kecleon shop in mystifying forest that's how i got mine.
anywhere
usually,in a dungeon if you find a kelcleon shop.Or you could trade from Pokemon ex of time/darkness.
To get Latias in explorers of sky you need the place called sky fissure 10F & a thing called Secret stone plate or Enigma part in bag. Also to get Lotios in explorers of sky you need sky fissure Deepest part B5F
They can be sold at kecleon shops in dungeons
Im squirtle and i think you need water stone
Vulpix is a fire-type Pokémon.
It needs a Fire Stone.