Post Final Fantasy 6 GBA finds here
02000056 - Change to 01 to call a battle (doesn't work on world map). It seems to call the last battle you were in. Ace's enemy group mod works with it. - KE
0200004C - Screen fade. F0 is normal brightness, 00 is pitch black - KE
0200004D - Background brightness. 00 is normal, F0 is hellabright(tm) - KE
0200004B - some digits start a brightness loop. F0 will give you a seizure - KE
020000FF - Setting this to anything but 00 will put you in "oh chit KE hav to much sakeke" mode, world map only - KE