In Shopping Mall Nine (in Route 9) a Worker will give it to as a gift on the top section.
In Chargestone Cave, there's one in B1F (west of Team Plazma). They can also be found in the dust clouds of Chargestone Cave.
In Black City, you can by one from Ken for 10,000 Poke/Pokedollars in the Marketplace
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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'll need to use a Thunder Stone on a Elektrik.
you can find a thunder stone by checking the UNDERGROUND
You can't, it needs a Thunder Stone.
It's in Chargestone Cave. On the first floor west of team plasma.