Ash and friends are on their way to Lilypad Town where Dawn's next contest will be held. They arrive at Mt. Coronet, the massive mountain that divides the Sinnoh region in half. The mountain also divides the region's Pokemon, like Shellos. Some of the Pink Shellos have ended up on the opposite side of the mountain and so Ash and the others decide to take it back to the other side. While crossing the mountain, they end up falling down a tunnel where they are thrown into yet another sinister scheme by Team Galactic. Saturn and Charon have been sent to find the Spear Pillar and will stop at nothing to find it. Will Ash and the others be able to save themselves from Team Galactic?