All forms and how to get them in SoulSilver
Espeon: High Friendship in daytime.
Umbreon: High Friendship in nightime
Vaporeon: Water Stone
Flareon: Fire Stone
Jolteon: Thunderstone
Glaceon: Trade to Diamond and have it leveled up and traded back/Ice Rock
Leafeon: Trade to Diamond and have it leveled up and traded back/Moss rock
Eevee: Breed and get it from Bill
hope this helps