After you meet him in Mr. Pokemon's house you can again find him in Pallet Town located in Kanto.
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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.
Keep catching, there's more! Go to Professor Oak to get your Pokedex evaluated.
you get rock climb from professor oak after you beat all of the kanto gym leaders.
Pikachu was in the Poke Ball that Ash had received from Professor Oak.
No. Professor Oak won't give you a shiny Pokemon. he'll only give you a choice of three starter Pokemon at the beginning of the game.