You can find it if you do the Pokeathlon. Use your Pokeathlon points to buy a thunderstone. I know that they sell them, but the things they sell (other than the moomoo milk) changes every day. So, check each day! ^_^ Its how I got my leafstone for my Weepinbell, which evolved.
Hope this helps!:)
Pikachu to Riachu, and Eevee to Jolteon.
You can get a Raichu when you evolve Pikachu. You have to expose Pikachu to a Thunderstone to evolve it.
Pikachu+Thunderstone=Raichu Eevee+Thunderstone=Jolteon These are the only 2 pokemon that evolve with the thunderstone in pokemon emerald
Tynamo will evolve into Elektrik will evolve into Elektross with a thunderstone in Pokemon White.
All Right first you need a Pikachu. You can catch Pikachu in Viridian Forest from levels 4 to 7. Then get a thunderstone from a Lass on Route 29. Evolve it with a thunderstone or get a Pokemon that knows fly and fly there its easyer . XD
You can use a thunderstone on pikachu
The Pokemon that evolve using a thunderstone are: Pikachu into Raichu Eevee to get a Jolteon
Thunderstone can be used to evolve a Pikachu into a Raichu.
Thunderstone can be used on Pikachu and Eevee, it evolves Pikachu into a Raichu and Eevee into a Jolteon.
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.
its underground
electric type pokemon