From the Super Mario Wiki
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The Power Suit is one of Samus Aran's suits from the Metroid series. When she uses her Final Smash, the Zero Laser, and turns into Zero Suit Samus during the game Super Smash Bros. Brawl, her armor falls off and can be thrown at other players. But, if the pieces lay untouched for long enough, then they will disappear just like any other item.