You need to hack that Wii to play a pirated copy of Xenoblade. You either can do it with a chip (which you can ask to get it installed) or via a series of programs. For more information Wiiscenebeta.com has all you need.
PS: If you are going to pirate xenoblade you don't need to buy it. Just buy a writeable DVD and burn the iso into it.
I am dirty pirate and I suggest you become one.
EDIT: You where talking about the Wii U... I have no idea if it can be hacked, what I just told you is for the Wii.
"I've Underestimated the Horse Power from Mario Kart 8, I'll Never Doubt the WiiU's Engine Again"