in the house beside enterna citys gym
well, he should be at route 221 for Pokemon pearl and diamond
either by cheating or a wifi event (but wifi event expired)
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.
you cant
I will eat it!
professor oak gives it to you
Professor Oak is't in Pokemon Diamond . o.o Not that I remember lol I beat the game along time ago but I don't remember Professor Oak ever being in it since it's Sinnoh .
you have to see 150 Pokemon then talk to professor oak..
route 224
no you have to catch it yourself
in the house beside enterna citys gym
you have to fill up your Sinno Dex then talk to professor Rowan and Professor Oak will come any more questions? email me Isaac@aapt.net.au
you have to complete the national pokedex and see professor rowan. then professor oak will come in and give you the pokeradar.
professor oak only appears in diamond but if you want to meet him try sapphire version
Well if you mean National Dex then you need to see the 150 sinnoh Pokemon then go to Professor Rowan and he and Professor Oak will upgrade it