Episode 248 - The Ultimate Battle! Luffy and His Crew Face the Pirate King’s Challenge

Episode 248
The Ultimate Battle! Luffy and His Crew Face the Pirate King’s Challenge
Japanese: 究極の戦い！ルフィと仲間たち、海賊王の挑戦に挑む
Kyūkyoku no Tatakai! Rufi to Nakama-tachi, Kaizoku-Ō no Chōsen ni Idomu

The crew sets sail once again, leaving behind the island where they helped to bring peace. As they continue their journey, they encounter a strange phenomenon in the ocean that leads them to an uncharted island. The island holds a powerful secret, and the crew must uncover it before others do.