Instructions
Pick a team with a player with a high dunking skill like the Los Angeles Lakers with Kobe Bryant or the Cleveland Cavaliers with LeBron James. Only players with a high dunking skill can perform a 360 dunk.
Maneuver your high-dunking player so he has a clear path to the basket. Hold "R1" and move the left analog stick in different directions to fake out the opponent.
Dribble toward the basket holding "R1," the turbo button, and once you are a few feet from the basket, move the right analog stick to the left, which calls for a fancy dunk. Then spin the right analog stick clockwise or counter-clockwise in a 360 degree motion (one full rotation) for a 360 dunk.