when you get anational dex go to pal park he will give you a new app ten go to eterna city and go to his house <-------------this works
(when you talk to him he also gives you the up-grade. He says the up-grade evolves a Pokemon when it is traded while holding it the Pokemon is porygon) (you get porygon from a person in veilstone city)
go south of enterna city left of the eterna gym. There is a small house and there he is
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Moltres will roam around the region in Pokémon Platinum after you talk to Professor Oak in Eterna City once you beat the Champion.
in eterna city
They roam the Sinnoh region after you talk to Professor Oak in Eterna City after getting the National Pokedex.
He is in Eterna city next to Pokemon center!
Professor Oak will not appear in the Lab in Sandgem Town until you complete the Sinnoh Pokedex. He will reward you the National Dex when you arrive there.