while the game is saving, you turn the ds off. and says the save file was corrupt. then you load your game. if you keep doing this, could you actually lose your game? is it best to wait at the last point of its saving waiting...
Are you implying that you're too impatient to wait for the game to save before you turn it off? O_o
As far as I know, no you can't lose your save file. The game keeps a backup of your last save and will start from there if the save data got corrupted.