From the Super Mario Wiki
When using this attack, Luigi hops on a giant ball, and Mario has to spike it by pressing the button. After a while, it falls on enemies. While it's landing, the player has to control Luigi to put him in the middle of the ball and press the button. After that, the ball floats down to Mario so he can spike it again. If Luigi is too close to one of the edges, if the wrong button (or no button) is pressed, or when Mario fails to spike, the attack stops. This attack, along with the Yoo Who Cannon, uses seven SP. To use it, the player must collect all 10 Energy Hold Attack Pieces.
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