First, you have to get an eevee by
Then, use thunderstone (Jolteon), water stone(vaporeon), or fire stone(Flareon) on your eevee.
Or you can just migrate them directly from a gba game.
EDIT:
When you get the Eevee from Bebe in Hearthrome city, you can breed it, regardless of its gender. Go to route 218 (the route between Jubilife City and Canalave City) and us the Poke Radar to catch a Ditto. Then leave the Eevee in the Daycare canter with the Ditto, and they will produce an egg. Talk to the man outside the daycare center to get the egg. Breed it as many times as you want. (note: your Eevee and Ditto DONT have to like each other. If you talk to the man outside the daycare, he will most likely say that they don't seem to like each other very much. This doesn't matter. They will still produce and egg, and it will still be an Eevee.)
There are 7 different evolutions of Eevee:
1. Vaporeon (evolves with water stone)
2. Jolteon (evolves with thunder stone)
3. Flareon (evolves with fire stone)
4. Espeon (evolves with happiness and daytime)
5. Umbreon (evolves with happiness and nighttime)
6. Leafeon (evolves when leveled up next to the mossy rock in Eterna forest)
7. Glaceon (evolves when leveled up next to the icy rock on route 217)
and then of course you can keep it as regular eevee, but that proves difficult because eventually it becomes very happy with you, and then it will evolve into Espeon or Umbreon. Leave the first eevee in the daycare with ditto, and you should have enough eggs to have all seven evolutions in a day or two.
Actually, if you would just like Eevee, the fact that it might evelve into Espeon or Umbreon can easily be oblivated! Seriously! There is a trick to stop evelotuion! Press the B button before it fully evolves, or give it the everstone that you can get from the haunter that you can trade for a buizel in Snowpoint or somewhere!
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