u have to go to events and go to pal park to migrate from other games
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IN Pokemon platinum you find this Pokemon on route 201(after you get the national pokedex you put fire red version into your DS)and he will appear.Samething with Pokemon pearl and diamond.
I believe you meet him after completing the Sinnoh Pokedex. Then he will update your pokedex to national.
In the Sinnoh Pokedex it is Feebas and Milotic, however, in the National Pokedex it is Omanyte and Omastar.
After you get the national pokedex, insert a Pokemon leafgreen cartridge into the nds, and you can find vulpix in route 209
you need to find 210 Pokemon to complete the pokedex