you have to have the gba game in the nds and in the beggining of the game right ...

you have to have the gba game in the nds and in the beggining of the game right after you
press start from the start screen it should have the option to migrate from whatever gba
game you have in there then you will automatically go into the gba games pc and you pick
the pokemon you want to migrate,but you could only pick six pokemon and you have to wait
24 hours if you want to migrate again then you will go to the pearl game and use fly and
fly to the low left town and you go in the building and out the back and thats whare youll
find the pokemon

You also need the national dex before you can migrate