he will review your progress on the national pokedex
and if u have the national pokedex, he will talk about the bird Pokemon Arcticuno, Zapdos, and Moltres. then if u have the poketch app that shows where traveling Pokemon are, 3 more will show up which will be Arcticuno, Zapdos, and Moltres.
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After you obtain the National Pokédex and visited the Pal Park, Professor Oak appears in the southernmost house in Eterna City.
Bottom left.
He is in a house in the southwest corner of the city.
If you have the National Pokedex, Prof. Oak will be in a house in southern Eterna City.
He isn't in Pal Park, he's in Eterna City