He will apear in Eterna city in the house right from the gym
After you obtain the National Pokédex and visited the Pal Park, Professor Oak appears in the southernmost house in Eterna City.
pretty much go wherever. go to pal park and everything. the object is to fill up the national dex
He gives you an up-grade after you go to pal park (no you don't have to migrate) and he's in the little house at the southernmost point of Eterna city
After you get a sight of all 210 Pokemon, go back to the lab of Rowan and speak to Professor Rowan. Follow Oak to the new Pal Park, then go to the house near the Eternia Gym. Oak will then give you an upgrade
you get it from professor oak at the pal park
You can get it from Professor Oak, in Pal Park.
visit pal park in route 221 and he will be there. After that u can find him in his house.
He is either outside the Pal Park or inside the building. You get to the Pal Park by taking the sea route using surf from Sandgem Town
He will apear in Eterna city in the house right from the gym
You can get him in Pal Park or you can trade with a friend who has Heart Gold and got Squirtle from Professor Oak.
After you obtain the National Pokédex and visited the Pal Park, Professor Oak appears in the southernmost house in Eterna City.
got to eterna city and go to the house that normally is empty and he will be there
You get it from Professor Oak after completing the Sinnoh Dex, getting the National Dex and going to Pal Park.
After you see EVERY Pokemon in the original Pokedex you go and visit the professor in Sandgem town then professor oak will come and give it to you then you also unlock the pal Park still must migrate Pokemon at the pal park
If you mean how to unlock Pal Park, all you need to do is defeat elite four and obtain the national Dex(For platinum is 210 Pokemon and diamond and pearl is less-er than platinum) and go to professor rowan and you should see professor Oak coming into the Lab and professor Oak will talk about Pal park and he will upgrade your pokedex into National Mode and after he talked about it... Professor will give you a poke radar and then you need to go outside of the Lab and go to the beach... just near Sangem Town and swim right side of the ocean, and you should be able to arrive to Pal Park
Talk to professor Rowan and Preffesor Oak comes and talks to you and says something about pal park and where it is than you can go to it but you need the national dex