That can be either a Pikachu to a Raicho. Or a Eevee to a Jolteon.
Thunderstone can be used on Pikachu and Eevee, it evolves Pikachu into a Raichu and Eevee into a Jolteon.
pikachu then pikachu evolves with a thunderstone to get raichu
Two Pokémon evolve using a thunderstone: Pikachu to evolves into a Raichu and Eevee evolves into a Jolteon.
pikachu evolves into raichu if you use a thunderstone on him other Pokemon evolves to if you use it but i don't now them DIAMOND AND PEARL ONLY
it evolves curtain thunder Pokemon
It evolves Eevee to Jolteon. It evolves Pikachu to Raichu.
Eelectrik into Eelectross
In Generation III (Ruby, Sapphire, Emerald, Fire Red, Leaf Green), the only Pokemon that evolve with a Thunderstone are: Eevee, which evolves into Jolteon; and Pikachu, which evolves into Raichu.
You get it by digging underground.
it evolves pikachu to raichu. have fun!
Pikachu evolves into Raichu with a ThunderStone.
The Pokemon that evolve using a thunderstone are: Pikachu into Raichu Eevee to get a Jolteon