To understand when Luffy uses this ability, one must distinguish between his instinctive bursts of power and his actual awakening. The earliest instance of Luffy using Supreme King Haki occurs in , titled "Explosion! The Secret Kuma"; however, at this point, Luffy has no control over it. Following the trauma of Gecko Moria stealing his crew’s shadows, Luffy lets out a roar of rage and frustration. This unconscious burst knocks out the weaker members of the Rolling Pirates. While this is the first confirmed usage, it is an instinctual reaction rather than a technique Luffy can wield at will.
However, the true answer to when Luffy actively and masterfully uses Supreme King Haki is found in , titled "The Beginning of the New Chapter! The Straw Hats Reunited!" This episode marks the end of the two-year training timeskip. Having trained with Silvers Rayleigh, the First Mate of the Pirate King, Luffy returns to Sabaody Archipelago. When confronted by the imposter Straw Hats and a Marines platoon led by Sentomaru, Luffy demonstrates his growth. In a flash of lightning, he knocks out 50,000 members of the New Fish-Man Pirates (though this specific feat happens shortly after in the Fish-Man Island arc, Episode 517 is the reunion where he displays the conscious ability to use it). This moment signifies that he has moved past accidental bursts and now commands the will of the conqueror. which episode luffy use supreme haki
The most significant evolution of this ability—and perhaps the moment fans most associate with "Supreme King Haki"—occurs during the Wano Country Arc. In and subsequently in Episode 1046 , Luffy reveals the apex of this skill: "Infusion." Luffy learns that Supreme King Haki can be channeled into weapons and, crucially, the user's own body, similar to the technique used by his mentor Rayleigh and his nemesis Kaido. In his clash against Kaido, Luffy coats his fist in the dark lightning of Supreme King Haki, allowing him to bypass Kaido’s nearly impenetrable defenses without touching him physically. This is the "advanced" usage that elevates the ability from a crowd-control mechanism to a tool capable of slaying the strongest creatures in the world. To understand when Luffy uses this ability, one
has used (Haoshoku Haki) in several landmark episodes, each marking a different stage of his growth from unconscious bursts to absolute mastery. Key Episodes Following the trauma of Gecko Moria stealing his