either by cheating or a wifi event (but wifi event expired)
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in the house beside enterna citys gym
well, he should be at route 221 for Pokemon pearl and diamond
At the beginning of the game, Professor Oak is in Mr. Pokemon's house. Mr. Pokemon's house is north of Cherrygrove City. After that, Professor Oak is in Pallet Town in his Pokemon lab.
Pikachu was in the Poke Ball that Ash had received from Professor Oak.
Professor Oak's official lab is situated in Pallet Town, Kanto [Pokemon Red, Blue, Green, Yellow, FireRed and LeafGreen]. He does visit the protagonist of the subsequent Pokemon games, but he has no other lab of his own. In Pokemon Gold and Silver (Johto), Oak can be found on Route 30 in a small house. In Pokemon Diamond and Pearl (Sinnoh), Oak has a small house towards the South of Eterna City.