1. You need 2 Nintendo DS's.

2. You must have at least Yu-Gi-Oh! Nightmare Troubadoor (NT) or Yugioh Spirit Caller (SC) or both.

3. Make a wireless connection Chatroom on WC 2007 on DS 1. Then, use SC or NT to join that Chatroom in Wireless mode on DS 2.

4. If done correctly, you will unlock the following duelists:

Nightmare Troubadoor:

Yugi
Yami yugi
Joey
Kaiba
Yami Marik

Spirit Caller:

Jaden
Aster
Dark Zane
Alexis
Chazz

5. And for the Discs and Clothes:

Spirit Caller:

Slifer Red Jacket (Clothes, Male)
Obelisk Blue Uniform (Clothes, Female)
Alchemy Disk (Disk, Male and Female)

Nightmare Troubadoor:

Stuffy Collared Shirt (Clothes, Male)
Pink Suit (Clothes, Female)
Cheap Disk (Disk, Male and Female)

Also note: Yami Marik, Yami Yugi, and Kaiba have God Cards.