What is the pal park function on pokemon diamond,and how does it work?

How do you get it?I want 2 transfer my Pokemon from Pokemon Emerald 2 Pokemon Diamond.|||You have to complete the Sinnoh Pokedex. When you do, go to the professor's house and talk to him, then Professor Oak will come in and tell you that the Pal Park is open. Then, you just turn on the ds with Diamond and Emerald both inserted and select Diamond. In the opening menu where you select continue game, there will be a new option called Migrate Pokemon. Select this and pick six pokemon you want to transfer and then you just continue your Diamond game and go to the Pal Park where you have to catch your Pokemon in the catching show (don't worry - the Park Balls work as masterballs, so all you have to do is find your Pokemon).|||u have to get the national dex then put your emerald in go to your


diamond and push migrate from emerald then chose the pokemon u want u have to wait a day before u can do it do it all over|||After you get the national dex you can go to Pal Park, and it's where you can transfer your 3rd gen Pokemon to D/P.