Action Command Dojo
From the Super Mario Wiki
The Action Command Dojo is an area in Paper Mario: Color Splash. It is in a small warehouse that can be found in the yellow district in Port Prisma. The building is mostly empty, though there are some boxes on a shelf, a crate, a sideways wardrobe, and some cabinets. Some of the paint on the walls is peeling, and a cobweb can be seen on the wall. The entrance to the Prisma Museum can be found above the cabinets.
The Action Toad lives in the Action Command Dojo. Mario can speak to the him to practice the timing on some of his Action Commands, such as Jumps, Hammers, Fire Flowers and Blocking. A cardboard Goomba is used as a target. The Action Toad says that he has a television with surround sound in the Action Command Dojo, though it is never seen.