Shadow Mario Paint
From the Super Mario Wiki, the Mario encyclopedia
Shadow Mario Paint is Bowser Jr. and the Koopalings's Final Smash in Super Smash Bros. for Nintendo 3DS / Wii U and Super Smash Bros. Ultimate. Upon activating the move, they will transform into Shadow Mario, leap into the air, and paint a large graffiti "X" across the screen before transforming back and dropping back down to the stage. Opponents caught in the "X" will be bounced around and take damage. After a short period of time, the "X" will flash rapidly and then explode, launching the opponents.
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