https://wccftech.com/nintendo-switch-wireless-controllers/

Super Smash Bros. Ultimate is right behind the corner and, like previous entries in the series, it’s best played on a GameCube controller. Right in time for the game’s release, 8BitDo will release a wireless controller adapter which will allow players to use a classic GameCube controller as well as a few others with the Nintendo Switch.

The GBros. Wireless Adapter for Nintendo Switch allows players to use original wired controllers like the GameCube, NES, SNES, SFC Classic Edition and Wii Classic controllers. The adapter also has built-in home and screenshot buttons, so players using classic controllers won’t have to deal with any missing feature. The adapter also works on Windows PCs.