During the Nintendo E3 reveal presentation it was announced that Super Smash Bros Ultimate on the Nintendo Switch will support GameCube controllers. They have been added due to popular demand. These will be available later this year once the game has been released.
GameCube Controller Support Has Been Added To Super Smash Bros Ultimate On Switch

Wolf is back. AHHH if I can get also Bandana Dee I’m 100% happy for this
You should leave this website and seek professional help.
WTF ARE YOU EVEN TALKING ABOUT???!!!!
SO WERE ARE THE 3 POSTS
the real question now is how will it work in handheld mode
If it’s via the same adapter that the Wii U used, then it’ll only be useable in docked mode.