Oak just shows up out of nowhere that's it.
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Complete the Unova pokedex (after that coplete the national pokedex)
Pokemon 386 completeYou get a diploma from a gamefreak guy located in Celadon City.
If you complete the national pokedex, go to visit Prof. Oak and he will give you a ticket to a place called foggy valley. You have to get a ticket because it is also an island.
pokedex or National
nothng happens