Fight Pad Pro GameCube Style is one of the best input devices if you want to play the "Super Smash Bros." video game. This controller is made to function with the Nintendo Switch system and it has the Super Mario logo on it, but it's a dpd Games product, inspired by the GameCube Style product.
The difference between the 2 branded items is the detachable C-stick. You can use the traditionally-sized one or upgrade to a larger one.
This controller is wired, thus it has to stay connected to your Nintendo Switch, Switch Lite, or OLED at all times to function. The wire has a length of 10 feet so you have plenty of freedom when playing if you need it. The connection to the system is through a USB port, thus the device has a very retro appearance.
This device has been tested and licensed by Nintendo. While it has the Mario Brothers logo on it, and it is one of the best controllers for this game, many other games can be controlled with it. These include Animal Crossing, some Pokemon installments, and LEGO Marvel Super Heroes.