Moonshell's a homebrew app to play music and movies so it's probably not that
There's a sweet guide here on supercard patching http://gbatemp.net/index.php?showtopic=29411 , the patching process should be the same whether it's supercard or sclite
I think he means, how would Pokemon Diamond/Pearl in the DS slot be able to access the gba flash cart save of FireRed/LeafGreen/etc. It'll be interesting to see if that could happen.. unless you know it can..