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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.
i have Pokemon soul-silver and i evolved my evee using a thunderstone
pikachu then pikachu evolves with a thunderstone to get raichu
Pikachu+Thunderstone=Raichu Eevee+Thunderstone=Jolteon These are the only 2 pokemon that evolve with the thunderstone in pokemon emerald