Traversing Mt. Coronet on their way to Lilypad Town and Dawn's next Contest, our heroes discover a lost pink Shellos. They soon learn that it lives on the west side of Mt. Coronet, but has mysteriously wound up lost on the east side. Agreeing to take Shellos back home to its herd, our heroes meet up again with Looker, who quickly heads out of the Pokemon Center just as they do.
Meanwhile, we discover that Team Galactic is inside Mt. Coronet and up to their evil doings, as usual. At the same time, Team Rocket secretly has their eyes on a mysterious case owned by Team Galactic, which Jessie is convinced contains treasure. But when our heroes accidentally walk into Team Galactic's operations, they are soon tied up and have to angrily watch while Team Galactic searches for what turns out to be the "Gateway to Spear Pillar"--one part of their evil plot to create their "New World". Fortunately, a disguised Looker bursts on the scene and ultimately frees Ash and friends. Team Galactic is able to continue their search, but when they come up empty-handed, a frustrated Team Galactic leaves the scene and Team Rocket is sent blasting off again.
With everyone safe and in one piece, our heroes bid Looker a fond farewell, return the pink Shellos safely to its herd, and their journey to Lilypad Town continues once more.