The Migerat can be obtained by inserting the GBA Pokemon game and DS Pokemon game in the DS load DS Pokemon game on main menu. This will give a number of options which can then be explored.
Migerat it or trade it. You can't use the cheat card on Pokemon platinum.
insert GBA Pokemon game and DS Pokemon game in DS load DS Pokemon game on main menu it said Migrate from (Pokemon GBA game) say yes twice. choose six Pokemon then it save on both games then go to pal park to receive those Pokemon
Migrating Pokemon can be difficult, put your gba Pokemon game in the slot in the DS put your DS Pokemon version in its slot turn on the DS make sure the GBA game is saved at a Pokemon center with the Pokemon you want to migrate in your PC once you save save your game in your DS Pokemon version then choose migrate follow the instructions and you must then choose the 6 Pokemon you want to migrate remember none can have HM moves.