After you surf to Pal Park , he meets you there then says he's off to Eterna City. Fly there, and his house is the one just before cycling road, on the left of the screen. When you talk to him there you will unlock the three legendary bird Pokemon, Articuno, Zapdos, and Moltres. (this might only be in Platinum) Track the bird Pokemon down, and catch them!
Prof. Oak is in a house in Eterana City.
as jou have the national dex then go to pal parkand talk to professor oak. then oak go's to eterna city and is in a house then talk to him and articuno moltres and zapdos wil fly trouch sinnoh
you have to see all of the Pokemon and then you get the national pokedex from Prof. Rowen and Prof. Oak in Prof. rowen's lab after completeing the Sinnoh pokedex.
you can get a national pokedex and a poke radar once you finish the sinnoh pokedex and talking to professor rowan in his lab. then you can go to professor oak house in eterna city(the small house in the very south of eterna city).talk to him and you will get an(up-grade)(an item that can be held by a porygon and trade it to evolve into porygon2).and by using an acion replay code you can get from him an(oak letter)that can be used to find shaymen.and you can get from him a star that put above the trainer's card when you finish the national pokedex and go to talk to him in his house.
You have to get your national dex show it to professer rowan then professer oak will come in then go to the pal pad park he will talk to you then he'll be in eterna city go to the house across the road from the gym he will be there talk to him then moltres zapdos and articuno will be roaming around sinnoh good luck finding them!
you get it from professor oak once you have completed the sinnoh pokedex. first you go inside rowans lab then professor oak will give it to you
I believe you meet him after completing the Sinnoh Pokedex. Then he will update your pokedex to national.
Professor Oak Is The Professor From Kanto(The Original Professor) Who Came To Sinnoh Because He Heard That Articuno,Zapdos,And Moltres Had Come To Sinnoh.
eterna city check every house
meet professor oak in pal park after completing the sinnoh pokedex.the go to his house in eterna city and there you go!
I think after you get the National Dex from Rowan/Oak, the legendary birds should be roaming around Sinnoh in the grass.
Prof. Oak is in a house in Eterana City.
After getting the national pokedex, prof. oak will be at eterna city telling you that he spotted a moltres within sinnoh. It will be roaming around sinnoh just like latios in hoenn. It will be level 60.
as jou have the national dex then go to pal parkand talk to professor oak. then oak go's to eterna city and is in a house then talk to him and articuno moltres and zapdos wil fly trouch sinnoh
once you've got the national dex talk to oak(house at very bottom of eterna) and the the 3 birds will roam around sinnoh
You have to finish the Sinnoh Pokedex and then you get the National Pokedex from Professor Oak when you tell Prof. Rowan you finished the Sinnoh Dex. After that, you can visit Prof. Oak in Eterna City and he will tell you about Zapdos, Articuno, and Moltres. Then, you will have a go at catching them, chasing them around Sinnoh.
Go to eterna city.At the botttom of the city enter the house to your left and oak will be there.If you have the marking map app for you poketch he will tell you the three bird Pokemon are in sinnoh and you can capture them.