Pokémon Ranger and the Temple of the Sea

Pokémon Ranger and the Temple of the Sea (2006) sees Ash and his companions navigating the Battle Frontier when they encounter a Pokémon Ranger tasked with delivering Manaphy's egg to a submerged temple. Their path is obstructed by a covetous pirate intent on seizing Manaphy's power for himself, setting the stage for a battle of wits and strength beneath the waves.