Many thanks for your answer.NDSGBA version 1.21 supports a game_config.txt file to be put in the NDSGBA folder which fixes quite some games, like pokemon and such, because it corrects the save size type to the right one or something like that and fixes other useful things.
Anyways, it boosts the game compatibility considerably.
Here's his thread: http://gbatemp.net/threads/iplayer-supercard-gbaemu-game_config-txt-improvement-project.248619/
Here's the latest game_config.txt: http://filetrip.net/nds-downloads/f...iplayer-gba-emu-gameconfigtxt-v13-f12630.html
I check it.