well you need could use a stone and evolve him:
water stone - Vaporeon
thunder stone - Jolteon
fire stone - Flareon
(u can also get a Espeon and Umberon, when ur eevee is level 27(i think its 27 if not its 26)depends on whats it like out side, if its dark out you will have a Umbreon, if its light out you will have a Espeon)
I hope i helped ;)
Also if you give evee 10 of each energy drinks (except for pp ups) after giving it all the energy drinks then give it one rare candy and it will evolve! if it evoles in the morning it will be espeon and at night umbreon! Hope this helps!
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In Pokemon Diamond, Pearl, and Platinum, if you want to evolve your Evee to a Leafeon you go to the Eterna Forest You will have to level up your Evee there and once it levels up by one level, it evolves to a Leafeon. If you want a Glaceon, you level up eevee on route 217. To get a Flareon, you give Evee a Fire stone. For Vaporeon, you give it a Water stone. And for a Jolteon, you need a Thunder stone.
i think you are supposed to make it happy and level it up in the daytime.
there is no specific time but if you use a stone lv. 20 and up
Level up an Eevee with full happiness at nighttime (after 6pm)
To evolve your Evee into Leafeon, get a leaf stone, and use it on Evee, and it will evolve into Leafeon! Have fun with Leafeon! -Garrett