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the Pokemon that evolve with the help of a thunder stone are : pikachu +thunder stone = raichu, or eevee + thunder stone = jolteon.
you can find a thunder stone by checking the UNDERGROUND
You can't, it needs a Thunder Stone.
A Thunder Stone is an evolutionary stone that allows certain Pokemon to evolve when exposed to it. In the third generation of Pokemon games, there is one Thunder Stone in New Mauville, and they can be had from the Diving Treasure Hunter for Yellow Shards.
You can evolve Eevee by giving it:A thunder stone evolves it into: JolteonA water stone evolves it into: VaporeonA fire stone evolves it into: Flareon