Luffy fights Rob Lucci in multiple key episodes, but there are two main clashes people usually mean:

  • First big fight (Enies Lobby arc):
    Their full battle runs across the late Enies Lobby episodes, with the core one‑on‑one fight starting around episode 294 and continuing through episode 309 , where Luffy finally defeats Lucci.
  • Rematch (Egghead Island arc, post‑timeskip):
    Their awakened-form rematch begins in episode 1100, “Powers on a Different Level! Luffy vs. Lucci!” , where Luffy uses Gear 5 against Lucci’s awakened Zoan form, and the clash continues into episode 1101 and beyond.

So if you’re asking “what episode does Luffy fight Lucci?” :

  • Classic Enies Lobby fight: start from 294 and watch through 309 for the full experience.
  • New Gear 5 rematch: start at episode 1100.

Information gathered from public forums or data available on the internet and portrayed here.