| Официальное спортивное соревнование по плаванию "День спринтера" | 25м |
| Москва (RUS) | 24.9.2023 |
This is likely what you mean by “using Supreme Haki” as a fighting style.
Luffy first demonstrates his Conqueror's Haki during the Marineford Arc (Episode 388 and 389, and more notably in Episode 391) when he is trying to protect his friends and particularly when he's fighting against Donquixote Doflamingo's subordinate, however the most pivotal and clear demonstration is during the Fishman Island Arc doesn't occur but rather during the Dressrosa Arc. which episode luffy use supreme haki
6. The Ultimate Evolution (Advanced Supreme Haki): Episode 1028 This is likely what you mean by “using
The sky above Onigashima was not blue, nor was it black; it was a churning vortex of green lightning and unnatural clouds. The war for Wano had reached its fever pitch, but for the Straw Hat crew, time was running out. The Ultimate Evolution (Advanced Supreme Haki): Episode 1028
One of Luffy's earliest displays of Haki was during his battle against Buggy the Clown (East Blue Arc, episodes 24-41). He used his Observatory Haki to sense Buggy's presence and anticipate his movements.
". In this episode, he unintentionally unleashes it to stop the bull, Motobaro, during the encounter with Duval. The Evolution of Luffy's Conqueror's Haki