The Game ID can be found on the front of the Game Card, at the bottom, below the small picture of the game.
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A game cartridge for the DS is called a game card.
On the front of the DS game card, near the bottom will be the game ID.
on the game card itself.
No, you have to have 2 Nintendo DS's to be able to trade but you do get an a attachment for you're DS that allows you to plug it into the DS card slot and have two DS card slot's
the data is not stored in the ds but on the game card