You can't unless you hack into the game's programming.
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Uh..Professor Oak..is... 1. In the introduction of the game.2. The Pokemon Lab in Pallet Town.3. On the PC as a menu option.4. Is in the room where you beat Gary as the champion.
he is in Viridian city after you deliver the parcel to Professor Oak you get 5 poke balls from him and then go to Viridian and he will teach you
Nothing because that cheat is fake. Sorry.
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.
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.