Take your Eevee to the Eterna Forest and level it up next to the moss rock.
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You have to get it from a friend who has Pearl/Diamond/Platinum
No, you cannot evolve Eevee with a leaf stone. It can evolve into the leaf type Pokemon, Leafeon, but it evolves by leveling it up in Eterna Forest in Pokemon Platinum
You can't leafeon doesn't exist in leafgreen.
Eevee can't evolve into leafeon in soulsilver you have to trade it to diamond and pearl and evolve it there. The ilex forest doesn't have a Mossy Rock - which is what evolves eevee into leafeon.
to get a leafeon in Pokemon platinum, you need to have an eevee and then at any lvl you have to use a leaf stone!