Win the Expert Cup. The Password Machine can now be accessed in the Duel Shop by tapping the slot machine on the left. The Password Machine allows you to type in the ID number of a card you have and insert it into the game (for 1000 KC). Passwords will only work if you have obtained at least 80% of the pack it comes in (you have the card list) or the card is on your card list (total). You can only get one copy of a card, and no God cards.
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You could play it on both. Any DS game can play on your DSi
either trade from nightmare troubadour or use an action replay (don't know the code though)
You get to level 22 and beat Yami Marik Then you will have all packs available however some cards you have to trade to get.
Unfortunately, no previous YGO! DS games can link with World Championship 2008, so you cannot get the God Cards from Nightmare Troubadour. I know for a fact that "Slifer the Sky Dragon" was offered as a downloadable card for one day, so perhaps that is the only way of getting the God Cards. yes ghosts exists.
I am also looking for this code but so far it seems s if there isn't one so sorry