well, he should be at route 221 for Pokemon pearl and diamond
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In Pokemon Platinum to get the National Dex you will need to have seen all 210 Pokemon in the Sinnoh Dex then talk to Professor Rowan and then after a while Professor Oak will give you the National Dex!
After seeing all the Pokemon in the Sinnoh Dex go talk to Professor Rowan and Professor Oak will come and give you the pokeradar as well as the National Dex.
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.
Technically, yes, but it isn't just the Pokedex. There are two requirements; 1. Beat the Pokemon League. 2. Find (It is not necessary to catch) all of the Pokemon in the Sinnoh dex, and then show to Professor Rowan, who then shows to Professor Oak, who then gives you the national dex. Note: To find Manaphy, read a book, and it shows you an image, which then records in your Pokedex. After these two requirements are met, then you can go to the battle zone.
You get the National PokéDex after seeing the 150 Pokémon in the Sinnoh Dex. After that go to Professor Rowan in his lab in Sandgem Town and talk to him and then Professor Oak will come in and present you with a National Dex as a gift. If you have been looking around on the Internet (more directly www.serebii.net) they will tell you that you need 151 (the +1 being Manaphy), Manaphy is only required in Platinum. -TyCundy