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 stone
You 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.
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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.
Pikachu and Eevee both need a Thunder Stone to evolve.