Luka returns to her friends by nightfall with supplies in her arms. She notices everyone is looking sad and they inform her that Team Rocket has captured Silver. Luka is shocked, but they have little time to discuss a plan. The parent Lugia suddenly emerges from the sea as it frantically searches for its child. Oliver tries to calm Lugia down, but he is too upset by the situation and begins tearing up. The parent becomes enraged and releases a gigantic storm that wreaks havoc across the island and the neighboring one. The dreadful conditions forces everyone to seek shelter in a cave. The large waves crash Team Rocket’s Magikarp submarine into a seawall, forcing the trio to abandon their vessel. The parent Lugia soon flies overhead and in a rage it Aeroblasts them off. Meanwhile, Dr. Namba watches the scene from the safety of his underwater base. One of the Team Rocket Grunts alerts him to the increasing surge in power, but Dr. Namba sniggers.
(Source: Bulbapedia)