you have to train or talk to them. well only you can talk in soulsilver or heartgold. i have played .
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Assuming you have an eevee, make it happy by giving it things from the medicine pile. Things like carbos and zinc work. You can find these in the department store in Veilstone City. Another thing to make your eevee happy is to give it massages at Veilstone City. There is a girl in a house that will ask if your Pokemon would like one. The last thing you can do to make your eevee happy is to walk around a lot!(you can check if your Pokemon is happy and likes you from the footprint dr. on the pastoria beach.) Once you think your eevee is happy, give it an exp share and battle a weak Pokemon with a strong Pokemon. In other words make your eevee level up. For umbreon, it must level up at night (after 8 to be safe). If you want espeon, make it level up in the day! Hope this helps!
You have to get an eevee then make it really really happy then level it up during the day. If you level it up during the night, it will become an umbreon. p.s. its spelled espeon
You train it at night and try to make it as happy as possible. I would recommend using the exp. share.
So, you need to give the eevee a soothe bell. You should also get it hiped up on vitamins, protein, ext. Then have it massaged by one of the two brothers in the Goldenrod tunnel. You also need to level it up. NEVER LET YOUR EEVEE FAINT! If you do, then it will be pissed. :) There is a lady in Goldenrod that tells you if your Pokemon is happy. Her house is by the poke mart (BIG). An Easier way to do this. Is to give your Eevee a Soothe Bell, Which is Obtained in National Park. Then Make sure you keep your Eevee 1st in your party. A trick I used to make it happy is to Get 5 Pokemon Eggs, Place them in your Party and hatch them all. I suggest Aerodactyl or Kabuto eggs the most. Now another thing is when you battle a Pokemon make sure Eevee fights and Wins. (I suggest you don't try this while doing the egg trick.) For Espeon Complete this Process before Night Time. And For Umbreon Complete this Process by Dawn.
Make Eevee as happy as you can. For Umbreon, level it up at night. For Espeon, level Eevee up in the day.