How many evolutions are there for Eevee in Pokemon Diamond and how can you get them all?

There are 7 evolutions in all and heres how to get them:

Jolteon- Use thunder stone on eevee -obtained near the Sunyshore Lighthouse

Flareon- Use fire stone on eevee -obtained at Fuego Ironworks

Vaporeon- Use water stone on eevee -obtained while Surfing to the hidden part of Sandgem Town

Umbreon- AT NIGHT : Make eevee happy! Using berries that make you happier (pomeg, kelpsy, ect.) Level it up! Use massages ( Veilstone/ resort area!) poffins (the kind they like)

Espeon- same thing as umbreon during the day!

Glaceon (my fav)- use rare candy on ice rock some in the top of route 217 or just train them by the rock!-obtained in The Lost Tower,while surfing to Canalave City,or in the Solaceon Ruins

Leafeon- Train Eevee by rock in Eterna forest or use rare candy!

Hope I helped !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

actually, you only use stones for flareon, vaporeon, and jolteon. for umbreon, you have to have a high friendship with it while you level it up between the hours of 8pm and 4 am. for espeon it is the same thing but it is between 4 am and 8 pm (or during the day). with glaceon you level it up near the ice rock on route 217. with leafeon you level it up by the rock covered in moss in eterna forest. hope i helped in any way shape or form!!!!!!!!!