All you have to do is train an Eevee to go up 1 level in Eterna Forest. This supposedly is for the Pearl version (never played it).
You level up evee in eterna forest
Level it up at Eterna Forest.
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
Get an Eevee and go to Eterna forest and level it up. You should have a Leafeon.
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.
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.
you have to take it into the eterna forest, find the moss covered rock and level up your eevee there. then it will evolve into leafeon.
You can't leafeon doesn't exist in leafgreen.
you can evolve evee to leafeon by taking leafeon to a stone in the forest by the second gym leader.
no have to trade from dppt
SINNOH In the Eterna Forest, there is a Moss Rock surrounded by patches of grass. Level up Eevee in these grasses and it will evolve into Leafeon.UNOVAIn the Pinwheel Forest there is also a Moss Rock that you can evolve Eevee into a Leafeon with.NeonBlue15
Glaceon: To get Glaceon you got to have an evee first then go to a route where in snows most likely stand next to a tree that has snow on it give the evee a rare candy and it should evolve to a Glaceon. Leafeon: To get Leafeon you got to have an evee first then go to a forest EX: Eterna forest then stand to a normal tree give the the evee a rare candy and it should evolve to a Leafeon. NO CHEATS!!!!!!!!!!!!!!!!!!!!:)