go to goldenrod and go in to every house and talk to every body. in one house u should find bill. have one spare spot in ur party and he gives u eevee. give eevee a thunder stone.
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You cannot get an umbreon on Pokemon Yellow as they were only introduced in Pokemon Silver and Gold and from then on. You can only get Vaporeon, Jolteon, and Flareon on Yellow.
Jolteon does not evolve, but to get a Jolteon you need a thunderstone to evolve an Eevee into Jolteon.
Jolteon
eevee