you need a eevee first and yoos a thunder stone on it and you can find eevee in mr.blackloks trophy garden p.s. you need a national pokedex so you can catch eevee.
Go to Goldenrood city.Goto the left.Go inside the yellow house.Someone named Bill will be there.Have an open space in your party.Talk to Bill.He gives you a eevve.use a thunderstone on eevve.
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i have Pokemon soul-silver and i evolved my evee using a thunderstone
use a thunder stone on eevee
Pikachu into Raichu, and Eevee into Jolteon. I don't recommend evolving Eevee into Jolteon. Espeon is way better.
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.
Electrode is the fastest Pokemon there is followed by Jolteon then Aerodactyl. The fastest 2nd generation Pokemon is Crobat.
Jolteon does not evolve, but to get a Jolteon you need a thunderstone to evolve an Eevee into Jolteon.
Jolteon can't learn Spark on Pokemon FireRed.
Jolteon.
Jolteon
Jolteon
jolteon
eevee