Team Rocket have revived the Tirtouga fossil and are now pursuing it so they can use it to open the Gate of Time. Determined to stop them, Ash and friends, along with Ferris and Sierra, escape in Sierra's truck in hopes of getting away from Team Rocket. However, Jessie and James soon catch up with them. During their brief scuffle, Tirtouga evolves into Carracosta and flees back to Twist Mountain. Upon arriving at Twist Mountain, Team Rocket succeed in capturing Carracosta and use its energy and open the Gate of Time. It is now up to Ash and the others to stop them from catching all the Ancient Pokémon of the past.