In Pokemon soulsilver, after you encounter with bill the first time you can go to goldenrod city and go to bills house and he will give you an eevee. if you want to breed eevees then you should make sure you save before talking to bill when he gives you the eevee. the best way to breed an eevee in soulsilver is to put a ditto and a female eevee in the daycare. and to get a jolteon you need to have the thunderstone. give the thunderstone to an eevee and it will evolve. you can get the thunder stone from the pokelthon dome.
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
no, only with another jolteon or ditto
Jolteon
jolteon
eevee
Jolteon is #135 in the national pokedex, and it is an Electric type Pokemon.
Lumineon and Jolteon
you can evolve pikachu into Raichu and Eevee into Jolteon
Nidoking and Jolteon