Thunderstones can be used on Pokémon to evolve them, two examples are Pikachu which can evolve into a Raichu and Eevee which can evolve into a Jolteon.
evee and pikachu
you need to give it a thunderstone.
Use a thunderstone.
electric type pokemon
evolve pikachu usin a thunderstone
The thunderstone has an effect on three Pokemon:Evolves Pikachu into RaichuEvolves Eevee into JolteonEvolves Eelekrik into Eelektross
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
Two Pokémon evolve using a thunderstone: Pikachu to evolves into a Raichu and Eevee evolves into a Jolteon.
In Pokemon diamond (what I have) you can get it underground or I think you can get it at the huge pokemarket in one of the cities.
NO you can not buy one, but you can get one in a trade or something
Pikachu --> Raichu Eevvee --> Jolteon
Okay, to get a Raichu on Pokemon diamond you need to have a Pikachu which can be found in Trophy Garden (Mr.Backlotts Mansion) and you need to get a thunderstone which can be found underground near oreburgh city and you need to use the thunderstone on the pikachu