Has Smash for Switch been announced yet?
Not yet, but it was recently revealed that the official GameCube controller adapter, which previously worked exclusively with Smash Bros for Wii U, works with the Switch in TV/docked mode as of the 4.0 Update!! So maybe soon!!! :D
Here’s how to connect your GC Controller to the Swtich:
1. Plug the adapter into the USB port inside the Swtich (between the HDMI and AC Adapter ports). 2. Make sure that wired communication is enabled in Settings > Controllers and Sensors. 2. Go to the Controller menu on the Switch and choose Change Order/Grip. 3. Press L+R on your GameCube Controller.
If it connects, you’re good! If not…
6. Connect a pro controller or pair of JoyCon and hold down + and -. 7. Back out of the menu that shows up and try step 3 one more time.
Now you should be able to use the GameCube Controller in the Switch UI and any games! The only problem is that there’s only 1 Z button, which functions as ZR. So, some games may not be as playable as others (i.e., Zelda BotW), whereas others will be just fine (i.e., MK8D). Have fun!
Source: https://www.youtube.com/watch?v=oIXyC6-pWEc Thanks to Aeolis in the comment section for the troubleshooting!
Edit: once you’ve done this method once, you can just connect it like any other controller.
