You can't,but you could send it over to a Diamond or Pearl game and level it up in Eterna forest. :D I hope this helped!
Yes u can
you cant get glaceon or lefeon in soulsilver
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.
Eevee ----ANSWER 2: it wont work, for Leafeon, u need to have a person with diamond, trade an eevee over there, have them go to the forest after "flower town" and have eevee go up a level, it should evolve into Leafeon after that
You can't leafeon doesn't exist in leafgreen.
To get a leafeon you need to get the eevee from bill in goldenrod city and level it in a grassy area
It cant
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!
In Pokémon SoulSilver, you can evolve Eevee into Flareon, Jolteon, Vaporeon, Espeon or Umbreon. Evolving into Flareon requires the use of a Fire Stone, evolving into Jolteon requires the use of the Thunderstone and evolving into Vaporeon requires the use of the Water Stone... in order for Eevee to evolve into Espeon, it requires max happiness and evolving in the day time and in order for it to evolve into Umbreon, it requires max happiness and evolving at night. Eevee will not be able to evolve into Leafeon or Glaceon because SoulSilver does not have the specific locations in the Johto or Kanto regions in order for them to evolve so you would have to trade them over to Diamond, Pearl or Platinum in order to evolve them into either Leafeon or Glaceon and then trade them back to SoulSilver.
leaf stone
the mossy rock in pinwheel forest
by using a leaf stone