Episode 416 - Luffy’s Promise to His Crew! The Final Fight for the Pirate King’s Treasure

Episode 416
Luffy’s Promise to His Crew! The Final Fight for the Pirate King’s Treasure
Japanese: ルフィの仲間への約束！海賊王の財宝をかけた最終戦
Rufi no Nakama e no Yakusoku! Kaizoku-Ō no Zaihō o Kaketa Saishū Sen

The crew successfully defeats the treasure hunters and uncovers the truth behind the artifacts. They learn that the artifacts are keys to unlocking the legendary treasure of the Grand Line. However, they realize that they are not the only ones after the treasure, and a new group of pirates emerges, eager to claim it for themselves.