Supper Mario Broth on Twitter: "Extracting the graphics of the Punch-Out microgame from WarioWare: Smooth Moves reveals it is run in a window with some black pixels in the corner. These match
WarioWare: Smooth Moves Wii Box Art Cover by MaterialChild92
Wii - WarioWare: Smooth Moves - Multiplayer Game Icons (Big) - The Spriters Resource
WarioWare Smooth Moves Multiplayer by BigMarioFan100 on DeviantArt