To get leafeon first get evee.Then go to the moss rock in pinwheel forest.Level up evee near the rock and it evolves into leafeon.
(dim wit) You can't catch them in Pokemon Leaf Green because Leafeon and Glacieon was discovered in the Sinnoh region (Diamond, Pearl, and Platinum).
I have a lv 100 leafeon
Vaporeon Jolteon Flareon Umbreon Espeon Leafeon Glaceon
In Pokémon Blac 2, you can find Leafeon by first finding its pre-evolved form of Eevee in Castelia City's Park. After finding one and catching an Eevee, you can take it to the Moss Rock in Pinwheel Forest and then you can level it up once and it will evolve into Leafeon.
Unfortunately, your mistaken. Eevee can only evolve into Vaporeon, Flareon, and Jolteon in Kanto games. Espeon, Umbreon, Leafeon, and Glaceon do not exist in Kanto. Therefor, you cannot obtain Leafeon in Kanto games. Leafeon and Glaceon only exist in D/P/Plat, and if you transfer an Eevee to Unova, Leafeon and Glaceon can be obtainable in Pokemon Black/White.You can't you can only get leafeon on pearl, diamond and platinum.
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.
By trading across from either Pearl, Diamond or Platinum version
You don't, they're Diamond/Pearl/Platinum only.
catch an eevee and use a leaf stone on it
The only way to get a Leafeon is by trading it to a Diamond, Pearl, or Platinum version and raising it up one level near the Moss Rock in Eterna forest.
(dim wit) You can't catch them in Pokemon Leaf Green because Leafeon and Glacieon was discovered in the Sinnoh region (Diamond, Pearl, and Platinum).
See the related link below.
leafeon
I have a lv 100 leafeon
You cannot evolve Leafeon.
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
Vaporeon Jolteon Flareon Umbreon Espeon Leafeon Glaceon