Our heroes are stuck in the coastal town of Porta Vista, waiting for the next ferry. However, they soon see an injured Horsea, who alerts them to trouble in the harbor. It seems a large school of Tentacool is terrorizing the sailors under the employ of Nastina, a rich old crone struggling to build a luxury resort on top of the coral reefs. She offers a large reward for the extermination on the Tentacool, which Misty immediately refuses out of her love for all water Pokemon. Unfortunately, this doesn't stop everyone else from signing up for the task, including Team Rocket, who try to use their special stun sauce to take the Tentacool out. However, all the sauce does is serve to both evolve and super-size one of the Tantacool into a giant Tentacruel, which leads the others into a revolt against all humanity. It soon falls to Misty and Horsea to find a way to bring peace between both sides, but if Tentacruel doesn't take them down, Nastina might