The gang is travelling near a mountain where they use the foggy path as a short-cut. Team Rocket are lost as well, so Jessie chooses a way, saying it is "woman's instinct". Ash is lost as well and soon falls down a narrow path. When they fall to the ground, they hear someone singing. Ash and Pikachu see a woman and they hear her and soon she disappears. Brock, May and Max came out of the fog, but see that Ash did not follow them. Ash nearly falls again to search for May, Max and Brock. Suddenly, Ash and Pikachu see a Baltoy. Baltoy goes to the cliff, so Pikachu tries to stop it using Thunderbolt, but Baltoy still spins on.
Pikachu uses Quick Attack, stopping Baltoy. A girl arrives, seeming to be Baltoy's owner. The girl demands to know why they attacked Baltoy, so Ash explains that it would've gone to the cliff. The girl apologises to herself and introduces herself to be Calista. Ash introduces himself as well. Meanwhile, Team Rocket fall down a narrow path, but Jessie is sure she saw a Thunderbolt attack, seeming it to be Pikachu who attacked. Calista says that near the mountain there are some ancient artefacts. She wants to be an archaeologist, but her parents took the collection she got, but she still has the book about the artefacts. One day, she got a phone call from a woman who seeks help from her and her Baltoy.
The woman recites a song and Ash continues - it is the same song the woman from before sang. Ash goes to show Calista the tree he found the woman in. Team Rocket overhear and promise to get the treasure from the mountain. The woman sings again, but is interrupted by Team Rocket, demanding the treasure. When the woman refuses, James sends Cacnea and Jessie her Seviper. The woman releases Xatu as well. Cacnea uses Pin Missile, but the attack is stopped when Xatu uses Reflect. Xatu uses Teleport near Team Rocket, then Peck on Cacnea. Ash and Calista arrive. so Cacnea uses Pin Missile, but is reflected by Baltoy's Rapid Spin.
Seviper uses Wrap, but Pikachu uses Thunderbolt, hitting Seviper. Xatu uses Shadow Ball, blasting 'em off. Ash and Calista turn to the woman, asking why she sang the song. The woman has no idea what she is speaking, so Calista fills her more about it. The woman then goes, so Calista and Ash follow her. Inside the tree, they fall down via a tunnel. They fall onto a soft hay and Calsita spots some marks on the wall. They are drawings of Baltoy when the humans lived in Baltoy civilization. Ash asks where the treasure is, so the woman points at some rocks. She explains that an earthquake happened, collapsing a part of a wall onto the machine, burying the woman's Baltoy.
Ash tries to lift the rocks, but with no success. The woman thinks Calista's Baltoy must use a proper attack for something to happen. Xatu uses Reflect and Baltoy uses Confusion, lifting the rocks and crushing them. The woman rushes to her Baltoy and takes it into the Poké Ball. Ash asks how she knew about the invention, but Calista brings her book, in which states nobody found the treasure. The woman brings her book out as well - saying her parents did not allow to study archaeology. Calista realizes her book is new while the woman's is older, so the woman tells that she used the book for her research...
The woman tells them not to think of it and that Calista's Baltoy use Rapid Spin in the center of the invention to show them what is the most valuable treasure of all. However, Team Rocket arrive in a drill machine. They grab the Baltoy and go to dig out the treasure. Xatu teleports and pecks the machine. The machine knocks Xatu out, so Ash realizes it is made of steel. Pikachu uses Thunderbolt, setting Baltoy free. Baltoy uses Rapid Spin, trashing the machine. Xatu uses Shadow Ball, blasting Team Rocket off. Baltoy uses Rapid Spin on the invention - the invention begins to glow...
The woman goes onto the machine, introducing herself as Calista - but from the future. She used the invention as the time machine. The treasure itself is time. Younger Calista wants the older to teach her, but the older says that she needs to be on her own, she cannot help her. Older Calista disappears into the future and Baltoy becomes tired. Younger Calista thanks the older for the lesson. Calista thanks Ash and asks how can she repay him, but Ash does not want any reward. Calista and Baltoy run off, while May, Max and Brock find Ash. Ash wants everybody to go to the next city for his Gym Battle, not wanting to lose time.
- Featured Pokémon: Ilumise, Crobat, Togetic, Lotad
- In the beginning of the episode, the classic Pokémon identification can be seen. In this case, it is a Raticate.