Synchro Ground-Pound

The Synchro Ground-Pound (alternatively spelled Synchro Ground Pound and synchro ground pound, also known as the Synchronized Ground Pound in American English and Synchronised Ground Pound in British English, and formerly known as the Simultaneous Ground Pound) is a variant of the Ground Pound that consists of multiple players performing a Ground Pound at the same time. The move is typically stronger than the normal Ground Pound and affects all enemies in a certain area, similar to a POW Block.

New Super Mario Bros. Wii
The Simultaneous Ground Pound is introduced in New Super Mario Bros. Wii, in multiplayer only. This creates a circular shockwave that quickly clears all enemies on the screen. It takes only three Simultaneous Ground Pounds to defeat Bowser prematurely in his first phase.

New Super Mario Bros. 2
The Simultaneous Ground Pound returns in New Super Mario Bros. 2, where it can be performed when Mario and Luigi ground-pound at the same time.

New Super Mario Bros. U / New Super Luigi U / New Super Mario Bros. U Deluxe
The Synchronized Ground Pound appears yet again in New Super Mario Bros. U, New Super Luigi U, and New Super Mario Bros. U Deluxe, behaving the same as in past games.

Super Mario 3D World / Super Mario 3D World + Bowser's Fury
The synchro ground-pound also appears in Super Mario 3D World and Super Mario 3D World + Bowser's Fury, yet again behaving the same as in past games.