You get eevee at Bills' house in Goldenrod City. Make sure you have one extra space in your party. Also you can get an eevee from a previous Gameboy Advance game if you had an eevee, then go to the Pal Park in Fuchsia City in Kanto.
(8 Badges of Johto and Elite Four need to be won.)
The only way to get an eevee in heartgold is if you talk with Bill in his house or if you trade
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get an eevee and evolve it into a thunderstone
You get it from bill in goldenrod city after you find him in the Pokemon center in the next town.thanks
thats not possible
To make Eevee evolve into an Umbreon, you have to level it up with high happiness at night.
Get the Eevee from Bill in Goldenrod city and give it a water stone.