i have Pokemon soul-silver and i evolved my evee using a thunderstone
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Jolteon
Jolteon does not evolve, but to get a Jolteon you need a thunderstone to evolve an Eevee into Jolteon.
The Pokemon that evolve using a thunderstone are: Pikachu into Raichu Eevee to get a Jolteon
Thunderstone can be used on Pikachu and Eevee, it evolves Pikachu into a Raichu and Eevee into a Jolteon.
a collector on route 212 named Douglas has a jolteon flareon and a vaporeon hope this helped : )