I tryed 18 different roms! I am doing everything right (I believe), and I have seen this problem on other sites but I find no solution, can someone please help me?
The ones I remember are: Pokemon Pearl, Warioware Touched (I tryed 4 different wariowares), Warioware D.I.Y., Mario Kart, Pokemon Diamond, Super Mario DS 64, and a few more.
Mariokart doesn't have AP so just backup the stuff on your memory card, reformat it then put the stuff back on then try again.