You'll need to trade for it or migrate it.
you have to go back to bebe(lady who created the poke boxes) have an open place for it
I think eeve is a trade only Pokemon from leafgreen/firered or from Pokemon colusseum.
that would be glaceon and you have to have an eeve and take it to snowpoint city and touch the ice rock then level it up
I don't know,but it might be the same question as "where to find a eeve in Pokemon diamod
Talk to the girl in the house next to Pokemon Center in Hearthome City. In Diamond and Pearl, you can only get it from her after the National Dex In Platinum, you can get it right away
You can go to bebe and talk to her and she will give you an eeve.(Notebebe is in Hearthom city she will give you an eeve only if you have the national pokedex.
Evee is not availiable in Pokemon Sapphire.
at the end of the game
You can't.
to an normal eeve
One of the NPCs in Celadon Mansion.
at leve 30 i think