Episódio 370 - A Aventura Final dos Piratas do Chapéu de Palha! A Última Batalha de Luffy

Episode 370
The Straw Hat Pirates’ Final Adventure! Luffy’s Last Battle
Japanese: 麦わらの一味、最後の冒険！ルフィの最終戦
Mugiwara no Ichimi, Saigo no Bōken! Rufi no Saishū Sen

The crew successfully completes the trial, earning the guardians' trust. However, the island’s peace is soon threatened by a group of mercenaries who want to take control of the island’s artifact. The Straw Hat Pirates must defend the island once more, reinforcing the theme of standing up for the weak and oppressed.