You need to max out your friendship level with it and level it up during the day.
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Well the weakest are umbreon and espeon because there all normal. But if i were to evolve my eevee i would evolve it into a Pokemon type i don't have or just put eevee in with a ditto boy and/or girl. actually umbreon is dark type and espeon is psychic, i would get flareon or jolteon
Trade an Eevee and have it traded back. Get out of the Union room and save your game, and turn it off, then on. Check out your ex-Eevee, because it's now a Stareon.
It does not evolve with a dusk stone in Pokemon Platinum
All of Eevee's evolutions are Flareon which is a Fire-type and it requires the use of a Fire Stone on Eevee in order for Eevee to evolve into it, Vaporeon which evolves from Eevee once a Water Stone is on it. Vaporeon is a Water-type. Jolteon, an Electric-type which evolves from Eevee once a Thunderstone is used on it. Umbreon, a Dark-type which evolves from Eevee via level up once it's night time and it's happy enough. Espeon, a Psychic-type which evolves from Eevee via level up once it's day time and is happy enough. Leafeon, a Grass type, it will evolve from Eevee once you level it up by the Moss Rock. Glaceon, an Ice type, it will evolve from Eevee once you levelit up by the Icy Rock. Sylveon, a Fairy type and it will evolve via level up from Eevee once it has 2 hearts in Pokémon Amie for affection and it also needs to have a Fairy-type move among one of its moves. Eevee learns Fairy type moves at Levels 9, 20 and 29.
You level the eevee up on a high-friendship level near an ice rock, same for leafeon near a mossy rock (there is one in the eterna forest and an ice rock in Mt.Coronet) The "ice eevee" is glaceon, and he evolves with leveling up next to an icy rock near a house at either route 216 or route 217 i don't remember which one. That's the same getting leafeon only you level up an eevee in the eterna forest to get him. Anyways, you have Eevee, and want to turn it into Glaceon, right? Because really, there is no "ice eevee". There is an ice EVOLUTION of eevee, but no ice Eevee. >.>. OK? OK. Now, go to Snowpeak, go into the grass, I believe you have to go down South a bit (Been ages since I played Dia/Pearl/Plat), but not too far South. I believe you then go right, and there should be the Icy rock or whatever it's called there. Level up your Eevee by that rock, and it should evolve into Glaceon with just one level.