Instructions
Go into the in-game store by selecting "Store" from the main menu. Look at the store's items for the "Yu-Gi-Oh!" in-game magazine.
Purchase the weekly in-game magazine. The God Cards are usually pulled from the magazine. Buy a "Yu-Gi-Oh!" magazine every week until you get a God Card.
Look at the God Card. If the card has a stats menu with question marks, it's a true God Card. Place the card in one of your decks for to show it off, or place it in your card collection.