You need the game Pokemon Leafgreen (GBA) in your DS's GBA game slot. (There is no GBA game slot on the Nintendo DSi).
Then you go to Route 209 or Route 214, Vulpix has an 8% chance of appearing.
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vulpix is not in Pokemon platinum version.
I'm not sure if you can catch Vulpix in Platinum but I do know that you can migrate it from either Pokemon Sapphire or Emerald, and some sources say you can even get Vulpix from Pokemon Leafgreen. I hope this helped.
no Pokemon evolves with a fire stone in Pokemon platinum except eevee which turns in to flareon
the trainer by that place, you know ? :)
You will need LeafGreenGBA, put that game and Platinum into your DS go to the route south-west of solaceon in the grass you can find Vulpix rarely. -Empol