saved but no saved was listed

i was playing Nostalgia DS on my 2.6A emulator noticed some writing error which isn't the major problem i see there and then icame to a point where i am able to save then the next day i tried to load but there wasn't any save files

Check your battery folder.Do you have more than one no$gba folder?
If so, check all the battery folder.If you can't find it, most probably you doesn't shut down your pc properly and caused you saved data disappear.

yah, we are right now that i remembered my computer got stuck when my pendrive was still sticking in the computer and another No$gba file =.= now i have come to realise it...i am such an idiot

It's common thing...
Good luck on the game :D