help!

ummm i nid help, m trying to play ds games on an emulator but none have worked so far, i tried desemu first and the only game i can play is phoenix write ace attorney. i tried ideas too and i couldnt play cuz it lagged so much. then theres no$gba. i tried playing ds games but it said failed to read file restart game and reinsert game card. >.<

Common Issues :) The save error should be covered there.

oh yeah... just read the common issues :p