Hi, are you using some code to bypass the blue/white screen? I used a code that did just that and another to enable to save in no$gba, but it crashed randomly and I lost all the progress from the time I opened the emulator, so I had to save and close no$gba every time I saved my game.
But I found a code that bypass the blue/white screen and enable the save game function.. it's for pokemon white only, don't know the code for black..
Hope this code works for you
you have to load the game, wait for the blue/white screen then press F2 and turn this code on, then reset the game (press * in the numeric keyboard)
52004EA0 E8BD01F0
02001800 E92D4008
02001804 E3A00000
02001808 E3A0150E
0200180C E2811A06
02001810 E5810B44
02001814 EA5FE9F2
02001818 E59F4034
0200181C E59F5034
02001820 E5845000
02001824 E59F4020
02001828 E5945000
0200182C E59F601C
02001830 E1550006
02001834 03A05001
02001838 05C4500A
0200183C 03A05000
02001840 E1445DB4
02001844 E8BD01F0
02001848 EA000D95
0200184C 02180C80
02001850 28AAFF1F
02001854 037FBFE0
02001858 EAA01606
02004EA0 EAFFF25C
D0000000 00000000