Bring a Pichu to Bill's Grandfather in Cerulea City where Bill lived in Pokemon Red & Blue.
with a thunder stone
the Pokemon that evolve with the help of a thunder stone are : pikachu +thunder stone = raichu, or eevee + thunder stone = jolteon.
you use it on some water type Pokemon to evolve them. example:pikachu+thunder stone example:polywhirl+water stone example:evee+fire stone example:Roselia+sun Stone example:murkrow+dusk stone a ever stone prevents your Pokemon from evolving
There is no such thing as a legend stone in pokemon.
thunder Pokemon if it has evolutions
You can find the thunder stone in New Mauville
you can find a thunder stone by checking the UNDERGROUND
The easiest way to get a thunder stone is to earn 2500 points at the place by the national park the thunder stone will not be there everyday because everyday there's a different stoneYou could show a Pichu to Bill's Grandfather on Route 25, or you can buy it on Thursdays in the Pokeathlon Dome for 2500 points.
Pickachu and eeve can evolve with the thunder stone
You can't, it needs a Thunder Stone.
thunder stone
If you go to the Pokéthlon on Thursday and Saturday you can purchase a Thunder Stone for 2500p(Pokéthlon Points). From a Woman inside the Pokéthlon Building.