NO you can not buy one, but you can get one in a trade or something
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Win the pokeathlon afew time then use the points to buy a thunderstone from the prize corner
Pikachu+Thunderstone=Raichu Eevee+Thunderstone=Jolteon These are the only 2 pokemon that evolve with the thunderstone in pokemon emerald
You can not buy Pokemon from the game corner in Pokemon diamond, but you can in heartgold and soulsilver
Pikachu does not evolve through level-up -- instead, you can use a Thunderstone for it to evolve.
near the munchlax statue by a rock it is hidden I found it behind the lighthouse, easy to get to