Evolve eevee by giving it happiness at night.
its gotta like you and then it will evolve, but only at night.
i believe buck has one in the battleground
Level up Eevee with high friendship between 8:00 pm and 4:00 am.
I would keep espeon,umbrean,leafon,glaceon,regular evee
You use a water stone ( If you want Vaporeon) Here are other ways, ThunderStone -> Jolteon FireStone -> Flareon High Friendship (Morning ONLY) -> Espeon High Friendship (Night ONLY) -> Umbreon Moss Rock (Diamond/Pearl/Platinum ONLY) -> Leafeon Ice Rock (Diamond/Pearl/ Platinum ONLY) -> Glaceon