There is a save-game file floating around the net that has 9 of each card. As far as I know, that's the closest you will get.
I have been looking at the format of the save-game file for YuGiOh GX a bit, myself, though. It would be nice to have an editor for this game. I'd be especially nice to edit your deck on a PC instead of on the DS.
Anyway, I would be interested to find out if anyone else has any other info about this, too!