Luffy's fourth gear is initially unusable and can only be unlocked in Chapter 8, Dresroze, during the battle with Doflamenco. After the battle, a cutscene will begin. Luffy will use the fourth "Elastic Man" form and defeat Doflamenco with the "Great Ape King Gun". After this battle, Luffy's fourth gear can be unlocked.
Another form of the fourth level, "Snake Man", will be unlocked later, but the series of skills of the fourth level can only be used by collecting soul crystals and advancing the main line. Unlike second gear, fourth gear cannot be entered directly without using an ability.
Advance the main storyline to Chapter 8 and start the story of Dresroze.
Defeat Doflamenco to unlock the first skill of Level 4 "Rubber Ape King Gun"
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