You can buy them from the pokeathlon, north of Goldenrod city. Just go to the main building of the pokeathlon, then to the right, the shop will sell them on certain days for 3000pp
the code do be for gold shiny thunder stone cheat am 9001
get a pikachu and geive it a thunder stone
The thunder stone is used to evolve electric types of Pokémon such as Pikachu. You can get one in Gold version in the Celadon City department store.
Buy it at Celdon Dept. Store.
you dont. you buy a life instead
the Pokemon that evolve with the help of a thunder stone are : pikachu +thunder stone = raichu, or eevee + thunder stone = jolteon.
you could go to the pokealoton and trade one for points
win 2nd place at a bug catching competition (fire stone or thunder stone 1st place sun stone)
You can get the thunder stone by going underground and digging for it in Pokemon diamond/pearl ( the thunder stone , fire stone, water stone, and the leaf stone is very rare, so good luck!).
You can find the thunder stone in New Mauville
you can find a thunder stone by checking the UNDERGROUND
Pickachu and eeve can evolve with the thunder stone