In Pinwheel Forest there is a moss covered rock near the start on the forest part. It is near the ranger, and the pond. Lv Evee up in the grass surounding the rock.
Source: Beat the game. :)
You can't leafeon doesn't exist in leafgreen.
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 the woods before Eterna, there is a Mossy Rock, you must have an Evee with you and a rare candy, stand next to it and level up the Evee and it will evolve to Leafeon.
You level up evee in eterna forest
you can't. there's no moss-stone to evolve it, so you'll need to trade it from diamond, pearl or platinum
you can evolve evee to leafeon by taking leafeon to a stone in the forest by the second gym leader.
Level it up at Eterna Forest.
no have to trade from dppt
Get an Eevee and go to Eterna forest and level it up. You should have a Leafeon.
by happiness (umbreon and espeon) by area (leafeon and glaceon) or stone (jolteon, vaporeon and flareon)
its not supposed to its there to evolve evee by leveling up evee next to it and it turns to leafeon (new evolution in pearl)
you can't you have to get an evee