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.
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If you have played R/B/Y/FR/LG, then Professor Oak's lab must be at Pallet Town. professors oks lab is in Tokyo
Oak's lab isn't in Pokemon diamond unless it's hidden. But you might be able to use action replay to make it appear. Hope i could help! Sorry the font changed.
You can get the Item finder from Professor Oaks in Pokemon LeafGreen. Professor Oaks is found on route 11 just out side of Vermillion City.
Professor Elm doesn't have a lab in Kanto, his lab is in New Bark Town in Johto. Professor Oak has the lab in Kanto (Pallet Town).
one of professor oaks aides gives it to you