Sabo spent years training under the Revolutionary Army, specifically learning "Fish-Man Karate" from Hack and combat skills from Dragon himself.
Sabo only regained his memories ten years later upon seeing a news report of Ace’s death at the Battle of Marineford. The shock of the name "Ace" broke the mental block, leading to an emotional breakdown as his past rushed back to him. IV. Key Themes and Significance One Piece (Dub) Episode 737
The English dub for this episode is available on platforms like Crunchyroll and Funimation . Sabo spent years training under the Revolutionary Army,
Sabo, Monkey D. Luffy, Nico Robin, Koala, Hack, and Monkey D. Dragon. III. Plot Summary Monkey D. Luffy