From the Super Mario Wiki
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The Tackle Shot is an Offensive Power Shot that Paula uses in Mario Tennis: Power Tour, but can also be unlocked for the player's own usage in story mode by gaining L1 Body, and thus first becomes available when the Tacklebot, the one source of PS Body, is unlocked after clearing the first round of the Island Open.
Upon activation, the user aligns themselves vertically with the ball and performs a run-up towards it, at which point they strike it in the form of a tackle, hence the name. This move is similar to the Barrel Cannon Blast.
"An aggresive shot that tackles the ball and sends foes flying"