Instructions
Start "Yu-Gi-Oh! Day of the Duelist." Select the "Edit Deck" option from the game's main menu.
Use your directional keypad to navigate through the decks and select a card. Press the "Select" button to switch between decks.
Press your GBA's "Left Shoulder" button to delete the selected card. Press the "Right Shoulder" button to add a card to your deck.
Press "A" to save your changes and press "B" to return to the game's main menu.