Challenge Dorothy at the school festival to make her your tag team partner.
Free Stuff
Try doing this in order to get three free cards and 10,000 DP. Keep in mind that this can only be done once per save file.
Step 1 - Connect your PSP to the USB port on your PS2.
Step 2 - Insert Yu-Gi-Oh! GX Tag Force 2 into your PSP, load the game, select "Database" and then "USB Connect".
Step 3 - Insert Yu-Gi-Oh! The Beginning of Destiny into your PS2, load the game, select "Database" and then "USB Connect".
If done properly, your prizes should be won thereafter.
Link bonus
Connect a PSP with Yu-Gi-Oh! Gx Tag Force 2 to your PlayStation2. Load the game on the PSP, then select the "Database" option, then then "USB Connect" option. On the PlayStation2, load the game, then select the "Database" option, then the "USB Connect" option. You will get 10,000 DP and three new cards. Note: This can only be done once per saved game file.
Raise character's trust
When trying to increase the trust of the main characters through conversation, find Pharoh (the cat) and get him to follow you. Every time you talk to a character that you can have a conversation with, no matter what option you choose, you will always have a "great conversation".
Sacred Beast cards
Successfully complete the game to unlock Uria, Lord of Searing Flames; Hamon, Lord of Striking Thunder; and Raviel, Lord of Phantasms.
Unlock cards
Go to the lab and enter these codes to get these cards.
armed dragon lv5[46384672]
collected power[07565547]
blast with chain[98239899]
ordeal of a traveler[39537362]
monster reborn[83764718]
mystical space typhoon[05318639]
nobleman of crossout[71044499]
cold wave[60682203]
banner of courage[10012614]
paralyzing potion[50152549]
axe of despair[40619825]
black illusion ritual[41426869]
liner accelerator cannon[64238008]
narrow pass[40172183]
Unlock Midday Constellation Booster
At the shop screen where you select the boosters, Enter the following code: Up, Up, Down, Down, Left, Right, Left, Right, X, O.
Dorothy...