Luffy's Gear 4 is not a single form but a technique with three distinct variations, each debuting during a major battle: (Bounce-Man) : : Episode 726 / Chapter 784. Context : Used to overpower Doflamingo
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: In the Wano Arc and beyond, Luffy has mastered the form enough to engage and disengage it more freely, significantly extending its duration. Expert discussions on Reddit highlight that Luffy's control over Gear 4 now allows for more "flexible" attacks, focusing Haki on specific parts of his body as needed. One Piece: All of Luffy's Gears, Explained - Crunchyroll
Luffy compresses his limbs like coiled metal springs, unleashing explosive propulsion that allows him to pseudo-fly by bouncing off air currents.
Monkey D. Luffy first transforms into during the Dressrosa Arc to overcome Donquixote Doflamingo. This monumental debut occurs in Episode 726 of the anime (titled "Fourth Gear! The Phenomenal Bounce-man!") and Chapter 784 of the manga. When Different Gear 4 Forms Appear