From the Super Mario Wiki
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The Dragon Shot is an Offensive Power Shot that Clay and Ace can use in Mario Tennis: Power Tour. L5 Muscle and L2 Body is required to learn it, meaning it becomes possible to learn after defeating Barb (singles) or Chas and Mel (doubles) in the first round of the Island Open to unlock the Tacklebot minigame. Upon use, the ball begins absorbing energy and the player smacks it towards the opponent's side of the court with minimal curve. Once the shot is performed, the ball will resemble a dragon's head until returned, in which case the opponent will suffer severe knockback.
"A powerful shot that pounds foes with a dragon-flame fueled ball."