you can find a thunder stone by checking the UNDERGROUND
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you can find them under ground or there is one in sunyshore city.
the Pokemon that evolve with the help of a thunder stone are : pikachu +thunder stone = raichu, or eevee + thunder stone = jolteon.
stones like water stone thunder stone fire stone i dont know the rest
You go to Sunyshore city. There will be a PokeBall Somewhere, You open it and there is a thunder stone. That evolves ur Eevee u can get from bebe (harthrome city,house next to poke center) into Jolteon. x]
Pikachu does not evolve by level in any Pokémon game, including Pokémon Platinum. Pikachu evolves into Raichu when a Thunder Stone is used on it.