The Pokémon that evolve via the Thunderstone are Pikachu which evolves into Raichu and Eevee which evolves into Jolteon.
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you can get the leaf stone, fire stone, and thunder stone at the big department store in celadon city. you get eevee in the back on the Pokemon mansion.
the Pokemon that evolve with the help of a thunder stone are : pikachu +thunder stone = raichu, or eevee + thunder stone = jolteon.
Pikachu and Eevee both need a Thunder Stone to evolve.
You can't, it needs a Thunder Stone.
Pikachu evolves into a Raichu by use of a Thunder Stone, the thunder Stone can be found in the Power Plant (requires Surf) and in the Celadon Department store for around 2000 Pokedollars.