You'll need a copy of Super Smash Bros. Ultimate for the Nintendo Switch. Make sure you have the game installed on your Switch or have a digital copy.
You can find various character unlock codes online or create your own using a hex editor. super smash bros ultimate unlock all characters yuzu
Once you've entered the cheat code, save it and restart the game. All characters should now be unlocked. You'll need a copy of Super Smash Bros
Download the latest version of Yuzu from the official website and follow the installation instructions. super smash bros ultimate unlock all characters yuzu