Using Real GameCube Controllers with Specific Adapters Official Wii U GameCube Controller Adapter: This adapter does not require any button configuration and works seamlessly with Dolphin.

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It may seem like a no-brainer, but the GameCube controller is probably one of the leanest controllers Nintendo's ever designed. Nowadays, controllers for consoles like the Nintendo Switch or Wii U ...

UPDATE 8/10/14 11.55am: The Wii U GameCube controller adapter will only be compatible with Super Smash Bros., Nintendo has now said.

So instead of having to fudge with multiple controllers, a Gamecube controller is a much better value than the classic controller.