Monkey D. Luffy ’s (Gear Fourth) is his ultimate power-up prior to the awakening of Gear 5 . Developed during his two-year training on Rusukaina , this technique uses Busoshoku Haki to inflate his muscular structure, granting him immense speed, power, and durability.
Luffy needed to match Katakuri ’s advanced Future Sight Observation Haki. who does luffy use gear 4 against
Previous forms (Gear 2 and 3) were insufficient to break Doflamingo’s defenses. Monkey D
Monkey D. Luffy first unleashed during his climactic battle against Donquixote Doflamingo granting him immense speed
For a broader perspective on how these transformations compare to his earlier power-ups, users on Reddit often discuss the visual and mechanical differences between his gears.