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Depends on which version of Pokemon you are playing. On Pokemon Silver/Gold for the Gameboy you get one from the egg centers.
Also, in D/P, Pichus and Pikachus are found in Mr. Backlot's garden, south of Hearthome.
You could also breed a female Pikachu with any other Pokemon in its' egg group, or an alternate would be to breed Pikachu with a ditto to get a Pichu.