i think you are supposed to make it happy and level it up in the daytime.
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To evolve your Evee into Leafeon, get a leaf stone, and use it on Evee, and it will evolve into Leafeon! Have fun with Leafeon! -Garrett
depends what do u want it to evolve into?
it depnds were u evolve it
Evolve from Eevee by happiness at day time.(4:00am to 8:pm)
Use a water stone.