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You go to the game corner and in the bottom right corner is a machine take photo and it will have the Pokemon in your party on your card, you can also change the colour of the card.
Usually on the back of the card in the lower-right corner .
If you're wondering where the code of which pack a card came from is, it's underneath the bottom right corner of the card art.
If it's the card's password code, it's at the bottom left corner of the card.
Top left corner, opposite the stamp (top right corner).