Once you get the water stone. Eevee can evolve into Vaporeon at any level.
Go to Bag > Items > Water Stone > Use > Eevee.
You need to evolve Eevee with a water stone
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.
I think its the water fire or lightning stone
to an normal eeve
Pickachu and eeve can evolve with the thunder stone
get eeve and use a fire stone
evee evolves into: Flareon with Fire stone Vaporeon with water stone Jolteon with thunderstone Espeon with friendship Leafeon with somthing idk Unbreon and Glaceon
there are three evolutions from eevee with stones. Jolteon with a thunderstone Vaporeon with a water stone Flareon with a fire stone. all three stones can be dug up underground with the explorer kit the thunderstone can also be found in Sunnyshore City
eeve into flaron vulpux into ninetales growlith into arcanie maybe more.......................................
To get one you have to give a water stone to a Poliwhirl.
Galatic Storage or Victory Road 1FL. And if you have a national dex take a eeve from BEBE (she lives in hearthome'S poke centers next). Then go to under ground if you have luck you can find dusk stone. And of course you can find water stone thunder stone fire stone etc.
Go into Etrena Forest from the flowery city above Jublife city then keep walking north the west hen you notice a green stone and level up Eeve there to get leafeon