first have the game in your DS then go to diamond. select the migrate from what ever game. pick the Pokemon from your PC. Say yes to the questions. now play diamond and go to the pal park. You find and catch all 6 Pokemon. And that's all you do:-)
Chat with our AI personalities
You go to pal park where you can round up your migrated pokemons
To breed Pokemon from Poekmon Fire Red to Pokemon Diamond you must put Pokemon Fire Red into the DS slot, turn the game on, select Pokemon diamond, press start and then in stead of pressing your file, scroll down until you see migrate from Pokemon Fire Red. This will bring you to your Pokemon Fire Red PC box and you can choose six Pokemon to migrate. After that you must go to Pal Park on Route 221 and catch those migrated Pokemon there. Don't worry, even if they're legendary, you catch them in one try. - BEWARE - POKEMON MIGRATED TO DIAMOND CANNOT BE MIGRATED BACK
You need to complete Pokemon Sapphire and Diamond and in Diamond you will need the National Dex. Go to the title screen of Diamond and press Start, then choose "Migrate from Sapphire" and follow the instructions. Choose the 6 Pokemon you want to migrate to Diamond, then confirm your choice. The 6 migrated Pokemon will be in the Pal Park and can be caught with 100% catch rate.
Either because you cheated and did not get the national pokedex or you have already migrated for that day. But probably cause you cheated.
it ispossible i have Pokemon platinum on my R4 and i migrated Pokemon from Pokemon ruby and it worked but first u need the pal pad you can get that when you have finished the sinnoh pokedex.