u can make it evolve by giving it any stone, or by levelling it up at a certain time of the day.
Water stone - Vaporeon
Fire stone - Flareon
Thunder stone - Jolteon
Level it up in the day with high happiness - Espeon
Level it up in the night with high happiness - Umbreon
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You can get an umbreon by getting an eevee from bill in goldenrod city (in a house) and then you can evolve eevee into umbreon by making it happy and leveling it up at night time.
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.
Its evolve to Vaporeon from eevee
Vaporeon - Evolve using Water Stone Jolteon - Evolve using a ThunderStone Flareon - Evolve using a Fire Stone Espeon - Evolve by happiness between 4am and 7:59pm Umbreon - Evolve by happiness between 8pm and 3:59pm Leafeon - Trade Eevee to Pokemon Pearl, Diamond, or Platinum, and level it up in Eterna forest. Glaceon - Trade Eevee to Pokemon Pearl, Diamond, or Platinum, and level it up on Route 217.
Evolve it from eevee