This is homebrew so this will void you warranty.
https://code.google.com/p/nintendon-t/
think I need a wii u now
-DMP-
https://code.google.com/p/nintendon-t/
- Play audio via disc audio streaming
- Full speed loading from an USB device, or a SD card
- Loads 1:1 and compressed .ISO disc images
- Works on Wii and vWii on Wii U
- Loads games as extracted files (FST)
- Memory card emulation
- Bluetooth controller support (Classic Controller (Pro), Wii U Pro Controller)
- HID controller support via USB
- Custom button layout when using HID controllers
- Cheat code support
- WiiRd (only on Wii)
- Changeable configuration of various settings
- Reset/Power off via button combo (R + Z + Start) (R + Z + B + D-Pad Down)
- Advanced video mode patching, force progressive and force 16:9 widescreen
- Auto boot from loader
- Disc switching
- Allow use of the Nintendo GameCube Microphone
- Use real memory card
- BBA/Modem support
- Play retail discs
- Play backups from writable DVD media
- Game Boy Player
- GBA-Link cable
How to set up: I will assume you already have the homebrew channel installed on your Wii U. If not, have a look at this guide. All you need is an SD card and Smash Bros Brawl.
Firstly, you need your gamecube games in ISO format. You can rip your collection using a homebrew'd Wii console and Cleanrip. I will not discuss finding ISOs by other means, as it's against NeoGAF rules, and it's bad to do.
So, you've got the games ripped onto your USB stick or SD card. Excellent! You now need GCIT, a windows app. Using this application, open each ISO and send it to your SD card or USB stick in a folder called GAMES on the root of the card. Select it to transfer in DiscEX format which Nintendon't can read. It's really quick to do this.
Almost there! Download the newest version of Nintendont. (always updated at this link)
Put this into your sd card in /apps/nintendont - name it boot.dol.
now load up the Wii U, go into Wii Mode, load up the homebrew channel, select nintendont and hooray! smash bros, on your Wii U.
think I need a wii u now

-DMP-

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My Wii is officially getting bushes
Dolphin