Sevili you need a "cheat code editor" i have dsone and i think its the same in dstwo.. google something like " dstwo cheat code editor" oder " dstwo how to cheat" or something in this way
sry my english is not that good hope i understand ur problem right
ShardFrost try to name it .nds like volt white 2.nds probably it helps, because my ds one card cant read a nds file without .nds in the name und try to start it with an emulator like desmune to check its your card or your file fault