thunderstone cave
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use a thunder stone on pikachu.
Use a thunder stone
You'll need to use a Thunder Stone on a Elektrik.
You can get it in Cerulean but pikachu won't let you use it on him in yellow.
Pikachu evolves into a Raichu by use of a Thunder Stone, the thunder Stone can be found in the Power Plant (requires Surf) and in the Celadon Department store for around 2000 Pokedollars.