From the Super Mario Wiki
The Mad Skillathon is a talent show event held in Wakeport in Mario & Luigi: Dream Team. Much like the Cholesteroad in Mario & Luigi: Bowser's Inside Story and the Attackathon in Mario & Luigi: Paper Jam, it consists of a series of endurance minigames involving Bros. Attacks.
There are three ranks the player can achieve, and like in the Cholesteroad, the player can earn prizes for achieving each rank: B rank (200 points) which awards the player 100 coins, A rank (500 points) which awards the player 300 coins, and S rank (800 points) which awards the player with an exclusive piece of gear. Each minigame automatically stops upon reaching 999 points. When S rank is obtained for all attacks, the player is awarded with the Pro Wear.
List of attacks