The technique is first used in his fight against inside the Tower of Law at Enies Lobby.
While attempting to reach Robin, Luffy finds himself blocked by a massive, reinforced steel door. He is heard activating a new technique, and a massive impact is shown blowing the door off its hinges, but Luffy himself remains off-screen to keep the form a mystery. when does luffy first use gear 3
Luffy’s use of Gear 3 is unique because the audience does not actually see the transformation the very first time it happens. The technique is first used in his fight