Chapter 303 - The Straw Hat Crew's Ultimate Quest! The Pirate King's Final Fortune

Episode 303
The Straw Hat Pirates’ Final Adventure! The Last Treasure of the Pirate King
Japanese: 麦わらの一味、最後の冒険！海賊王の最後の財宝
Mugiwara no Ichimi, Saigo no Bōken! Kaizoku-Ō no Saigo no Zaihō

The battle reaches its peak, with Luffy facing off against the rival captain. The episode emphasizes the themes of courage and persistence, as Luffy’s unwavering resolve inspires his crew. They must overcome their differences with the rival crew and find a way to coexist in a world full of dangers.