From the Super Mario Wiki
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Energy Ball is the Offensive Power Shot used by Paratroopa in Mario Power Tennis. It involves Paratroopa flying backwards, then spinning forwards again, igniting the ball with a shiny purple energy and making the stage darker. When hit, it goes high in the air similar to a lob shot. It sends players who hit it spinning in a tornado, making them unable to move for a few split seconds. It can be countered with Yoshi's Rainbow Flutter or a high range defensive shot like Donkey Kong's Boomerang Banana Return or Diddy Kong's Barrel Jet.