- Yellow Devil on Wily Castle
- Metal Face on Gaur Plain (Wii U only)
- Ridley on Pyrosphere
- Dark Emperor on Find Mii
That’s it. There’s only four of them.
A Wii U exclusive mode has been confirmed where one can control bosses with the Wii U gamepad. However, this only applies to the boss shown below.
There is no playable boss mode lol