I can't download pokemon diamond for gba
do you mean migrate pokemon from a gba pokemon game to diamond because if you do that you need to complete the sinnoh pokedex by seeing every pokemon in the sinnoh pokedex and then you can go to the pal park. Then put the gba game in the gba slot. Start up you diamond and on the menu there should be a sign that says, "Migrate from gba game"
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