it may be because you don,t have Pokemon emerald in the GBA slot.
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have Pokemon pearl and emerald both in the ds. it will say migrate from emerald on the Pokemon pearl screen. that`s all you need to know.
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.
You can, you have to go to Fuschia city where the safari zone was in leaf green and fire red. After that save it and turn it off to get to the home screen then click migrate from emerald UPDATED BY HEARTLESS: Make sure you don't forget to capture the Pokemon in Pal Park! I've made that mistake before, when I had no clue what I was doing, and I thought my Pokemon were lost!
First, obtain the national 'dex after seeing (or catching) all of the Pokemon in Sinnoh. Then restart your original DS or DS lite and insert your GBA (Ruby, Emerald, Saphire, Firered, Leafgreen) Pokemon game into the second slot. Then, on the main screen, it should say "Migrate from [GAME TITLE]" Trivia: Pokemon D/P will misspell Firered and Leafgreen's version names, separating them into two words. Hope this helps!
You need to see all the Sinnoh Pokemon, go and show the Prof in Sandgem Town your Pokedex, and he will tell you about Pal Park. Save your game and turn your DS off. Then slot your Pokemon Emerald Game Cartridge into the bottom of the DS and turn it on. Go on Pokemon Diamond/Pearl, and this time on the title screen it will say: Migrate From Emerald. Click on it and you can choose any Pokemon from your PC in Emerald and they will later be in the Pal Park. YOU CANNOT GET YOUR POKEMON BACK ONCE TRANSFERED TO DIAMOND/PEARL. Once you've picked your Pokemon, continue your Diamond/Pearl game and surf off the beach in Sandgem Town until you hit an island. Go through the grass and you will be at a place called Pal Park. The man in the entrance once you have entered the building will tell you about Pal Park, then you can enter, and the 7 Pokemon you chose from your Emerald PC will be available to catch in the wild. The Pal Park balls are just like Master Balls so you will always catch the Pokemon. You have now migrated your Pokemon from Emerald to Diamond. You must catch all 7 of the migrated Pokemon before leaving the Pal Park. They will each be in different habitats. Once you have caught all 7, they will be in your PC. Hope This Helped