Any Nintendo controller you can imagine works with Super Smash Bros. for Wii U.
☆ NintendObs Weekly – Monday, October 20, 2014 – Sunday, October 26, 2014.
You can play with a number of different controllers in the Wii U version.
Wii U GamePad
If you are playing alone, you can play using only the Wii U GamePad screen.
Wii Remote Plus
You can play by holding it sideways. You can use a normal Wii Remote as well.
Wii Remote Plus + Nunchuk
Wii Remote Plus + Classic Controller Pro
The game supports the Classic Controller as well.
Wii U Pro Controller
Nintendo GameCube Controller
You can connect up to four GameCube Controllers using one GameCube Controller Adapter. Connect the adapter to the Wii U console using two USB cables. (You can use the USB ports on the front or the back of the Wii U.)
Nintendo 3DS series systems
You can use the Nintendo 3DS family of systems as controllers as long as you have a Super Smash Bros. for Nintendo 3DS for each system.
Source: Smash Bros.
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