Yu-Gi-OWNED is an exploit for Yu-Gi-Oh 5D's Wheelie Breakers. It was only made for the PAL region, but the unofficial port (Yu-Gi-Vah) works on NTSC-U and NTSC-J Wii's.
Required:
* An SD card (Best results are with non-SDHC cards, SDHC will only work on 4.0 or above) or USB device formatted to FAT(32).
* Something to boot, like the hackmii installer (get the boot.elf).
*Yu-Gi-Oh 5D's Wheelie Breakers.

Links:
* Yu-Gi-OWNED (PAL)
* Yu-Gi-Vah (NTSC-U)
* Yu-Gi-Vah (NTSC-J)

Guide:

Computer ----------------------

1. Rename the Private folder on your SD card to "privateold" (if you had one).
2. Download the Yu-Gi-OWNED/Vah exploit for your region. In the pack should be a "private" folder, copy it to the SD card root.
3. Place whatever dol/elf you want to boot (usually the hackmii installer) in the SD card root.

Wii ----------------------
4. Go to the Data Management (Wii button > Data Management > Save Data > SD). Copy the Yu-Gi-Oh 5D's save file to your Wii.
5. Play Yu-Gi-Oh 5D's Wheelie Breakers. Now press the A button 2 times and the exploit should do its thing.