Tto get an eevee to max happiness you need to train it up in these ways: *Give them massages from the lady in veilstone city, and the ribbon syndicate in resort area
*go through the game without it fainting
*give it drugs, i.e. protein, iron, calcium etc.
*level it up without getting it badly injured / *dont let it die
*keep it with you as much as possible
*feed it poffins that match their tastebuds
*IF you want to, give it some berries that will make it friendlier, but beware it can lower somestats *DONT give it the exp. share, train it by yourself. **To check out if it has the happiness to the max, go to app with the pokes floating around and tap and hold on the eevee. If it has... *NO hearts - No friendship *1 heart - bit of friendship *2 hearts - more friendship, not max *2 BIG hearts - max happiness :)))))
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You have to get eevee to max happiness and level him up during night.
To evolve Eevee into Espeon in Pokemon Emerald you need to raise it's happiness to max and level it up during daytime. To raise happiness you can keep the Eevee in your team for a while and fully healed up it should eventually reach max happiness to evolve in the daytime.
Eevee doesn't have a set level to evolve into Umbreon. All you have to do to evolve it is max out its happiness at night. ~KKMG1
Umbreon doesn't have a stone. You have to max out Eevee's happiness and level it up at night.
I believe that you have to get the eevee to max happiness ( or really high ) and level it up in the nighttime. Which is some time from past 6 o'clock on your pokemon clock, to sometime in the morning.