You can't.
I think eeve is a trade only Pokemon from leafgreen/firered or from Pokemon colusseum.
Causes Weepinbell to evolve into Victreebel. Causes Exeggcute to evolve into Exeggutor. Causes Nuzleaf to evolve into Shiftry. Eevee does not evolve using a Leaf Stone into Leafeon unles you trade it holding one. You must evolve Eevee near the mossy green rock in viridian or eterna Forest for a Leafeon.
go to a moss rock level up eeve 1 to 10 times i think then thats leafeon
at leve 30 i think
eeve intoflairionand that fire dog into arkanine
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
Gloom, Weepinbell, Exceggcute and Nuzleaf
Pickachu and eeve can evolve with the thunder 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
i don't think you can since its a 4th generation Pokemon
Evee can't be found on emerald so get one in firered or leafgreen then trade it to emerald.
eeve into flaron vulpux into ninetales growlith into arcanie maybe more.......................................