Ash and friends stop in a town on the way to Snowpoint City. There they meet a girl who only likes cute Pokémon. After she insults Dawn's Piplup, Dawn challenges her to a battle.

Having become stronger as a team and joined forces with Grovile, Piplup and Chimchar head to the Hidden Land in order to stop the destruction of time. Grovile explains that Dialga, Master of Time, has been going crazy with its home of Temporal Tower collapsing, and is in the process of becoming the evil Primal Dialga of the future. The only way to stop the destruction of time is to defeat Dialga. When Lapras brings them to the Hidden Land, Team Pokepals head to the Old Ruins in order to ride the Rainbow Stoneship to Temporal Tower.