Can You Use a GameCube Controller on Call of Duty: Black Ops (Wii)?

Not natively. The Wii's GameCube ports are disabled in Wii-mode titles—Black Ops only recognizes Wii Remote (+ Nunchuk), Classic Controller, or Classic Controller Pro.

Workarounds (Unofficial)

• Wii → GameCube Adapter (Mayflash, Raphnet): Plugs into Wii Remote expansion port; maps GCN inputs to Classic Controller protocol. Compatibility varies—Black Ops may not recognize it.
• Homebrew (Nintendont / USB Loader GX): Run the GameCube version of Black Ops (doesn't exist) or patch the Wii ISO to force GCN input—complex, unstable.
• Classic Controller Pro: Best legal option—same layout as GCN, wireless via Wii Remote, officially supported.

Recommendation

Buy a Classic Controller Pro ($15–25 used). It feels like a GameCube controller, works natively, and supports every Wii/VC title.