You can use the Smash Brothers Gamecube adapter in portable mode with a USB C adapter (Rumble works too) : r/NintendoSwitch
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Ultimate GameCube Adapter by Panda Hardware — Kickstarter
Confirmed: The Wii U GameCube Controller Adapter will not work on DDR, Active Life, or Cyberbike | Gaming.Fit
/cdn.vox-cdn.com/uploads/chorus_image/image/33660051/wii_u_gamecube_adapter.0.jpg "Nintendo GameCube controller adapter coming to Wii U for Smash Bros. - Polygon")
Nintendo GameCube controller adapter coming to Wii U for Smash Bros. - Polygon
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Amazon.com: GameCube Controller Adapter : Video Games
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Best Controller for Super Smash Bros. Ultimate 2022 - IGN
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Nintendo Gamecube Controller Display - Etsy
Best Nintendo Switch GameCube Controller Adapters | Digital Trends
Amazon.com: Hyperkin 4-Port Controller Adapter for GameCube Compatible with Nintendo Switch/ Wii U/ PC : Video Games
How to use a GameCube controller in MultiVersus? - Dot Esports
HyperPodium 4-Port Controller Base for GameCube compatible with Nintendo Switch
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Guide to the Best GameCube Controller Adapter for Nintendo Switch
PIRANHA GAMECUBE CONTROLLER ADAPTER | Nordic Game Supply
The best Nintendo Switch GameCube controller | FOX31 Denver
