Installment 185 - Luffy's Initial Triumph! Facing the Pirate King's Army

Episode 185
Luffy’s First Victory! The Challenge of the Pirate King’s Forces
Japanese: ルフィの初勝利！海賊王の軍団との挑戦
Rufi no Hatsushōri! Kaizoku-Ō no Gundan to no Chōsen

As the Straw Hat Pirates explore the island, they encounter a powerful adversary who controls the island’s wildlife. This foe has been using the animals to attack anyone who comes close to the island’s secrets. The crew must defeat the enemy and uncover the treasure hidden within the island.