You have to use a leaf stone on your eevee. Sorry, I don't know where to find a leaf stone though. : ) hope this helped!
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To evolve your Evee into Leafeon, get a leaf stone, and use it on Evee, and it will evolve into Leafeon! Have fun with Leafeon! -Garrett
In Pokemon Diamond, Pearl, and Platinum, if you want to evolve your Evee to a Leafeon you go to the Eterna Forest You will have to level up your Evee there and once it levels up by one level, it evolves to a Leafeon. If you want a Glaceon, you level up eevee on route 217. To get a Flareon, you give Evee a Fire stone. For Vaporeon, you give it a Water stone. And for a Jolteon, you need a Thunder stone.
Evee will never evolve to leafeon in firered because leafeon wasn't created until diamond, pearl and platinum came out meaning it doesn't exist in firered.
eevee can evolve into vaporeon, jolteon, flareon, espeon, umbreon, leafeon, and glacieon.
Eevee has seven evolutions. It can evolve into Glaceon, Leafeon, Vaporeon, Flareon, Espeon, Umbreon, or Jolteon.