Yes. You can either breed a pikachu and a ditto at the daycare center or trade a pichu from another game.
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Pichu
it took me a while to find this out but its a pichu
Yellow Body and Red Cheeks before it evolves.....Thats Pichu
pokemon breeder in route 210 he has pichu, happiny,pikachu
you will not get a Pokemon from pichu and raichu they will just level up but if there was even the slightest chance of a Pokemon appearing it would be a pichu or pikachu