Ash and his friends are enjoying their time in the mountains. Brock releases Vulpix, allowing it to battle with Pikachu, but Jigglypuff gets in their way, and at the last minute, both Pokémon must redirect their attacks, so not to hit Jigglypuff. They end up firing on the side of the mountain, and the explosion uncovers the entrance to an ancient temple. A girl named Eve runs to them, and picks up a small, golden artifact from the blast site. She is an archeologist, and along with her crew, is gathering relics, from a time when giant Pokémon--Pokégods, if you will--were worshipped by humans.

In her trailer, she has several artifacts already, including a Psyduck statue, and a golden spoon. She also has a stone which looks like a tombstone,and says somthing about the earth and the Pokegods destroying there temple and someday the earth.

Night falls, and Team Rocket sneaks into the temple, hoping to find some treasure for themselves. Jessie sends out Arbok to go inside the temple and get the most priceless piece he can find. Arbok discovers something that resembles a bow tie, but as soon as it touches it, it is sucked inside. The "bow tie" then chases after Jessie, James, and Meowth, capturing them as well. In the morning, Eve finds the bow tie lying on the ground. One of her men touches it, and he is absorbed.

The air around the relic begins to shimmer, and an enormous Gengar comes into view, Gengar has black things all over his body. Ash and friends and Eve find cover in the trailer, but the rest of Eve's crew is absorbed by the monster. The monstrous Gengar turns away from the excavation site, and starts towards Pallet Town. Desperate to save his friends and family, Ash sends his out Pidgeotto, and Brock sends out Onix to combat the Gengar... but it absorbs them all.

Meanwhile, back in Eve's trailer, the spoon, and the relic that Ash found begin to glow. They touch, and a giant Alakazam is released. Alakazam and Gengar immediately begin to fight, and the Pokégods' immense power begins to tear the sky apart. Eve recalls some hieroglyphic tablets she found at the site, which described how the Pokégods had the power to destroy the world. The kids realize that they must stop the Pokégods, at all costs.

As if on cue, Jigglypuff appears, and the kids realize that she can sing the Pokégods to sleep. Jigglypuff approaches the fighting monsters, and sings its lullaby, but it is too small, and can not be heard. As Jigglypuff continues to sing, a fourth relic, sitting atop the temple's entrance, begins to glow. It floats over to where Alakazam and Gengar are fighting, and a giant Jigglypuff pops out!

The Jigglypuff begins to sing, using the relic as its microphone, but however this jigglypuff has a very deep voice. Soon, everyone is asleep. Enraged, Jigglypuff pops the cap off the relic, revealing an old fashioned ink brush... When Ash & co. awakens, they find the Pokégods gone, and the absorbed people freed. Eve decides that there are some forces that humans should not meddle with, and resolves to leave the artifacts in their resting place.

English Official Summary

While Ash and Brock are busy training for the Pokémon League, they inadvertently uncover a hidden temple containing Pokémon fossils. Misty recalls reading about a hidden city where people used to build temples to honor Pokémon. Could they have stumbled upon the ancient city of Pokémopolis?

Italian Official Summary

Durante un allenamento in vista della Lega Pokémon, Ash e Brock scoprono un tempio con dei fossili di Pokémon. Misty ricorda di aver letto di una città nascosta dove si costruivano templi in onore dei Pokémon. Che abbiano trovato Pokémopoli?

Portuguese Official Summary

Ao treinarem para a Liga Pokémon, Ash e Brock descobrem um templo com fósseis Pokémon. Misty lembra-se de uma cidade escondida onde se construíram templos em homenagem a Pokémon. Será esta a cidade ancestral de Pokémopolis?

Spanish Latin America Official Summary

Mientras Ash y Brock entrenan para la Liga Pokémon, hallan un templo con fósiles Pokémon. Misty recuerda una ciudad oculta donde la gente construye templos para los Pokémon. ¿Será esta la antigua ciudad de Pokémopolis?

Spanish Official Summary

Mientras que Ash y Brock están ocupados entrenándose para la Liga Pokémon, descubren sin querer un templo oculto que contiene Fósiles de Pokémon.

English Great Britian Official Summary

While Ash and Brock are busy training for the Pokémon League, they inadvertently uncover a hidden temple containing Pokémon fossils. Misty recalls reading about a hidden city where people used to build temples to honor Pokémon. Could they have stumbled upon the ancient city of Pokémopolis?

Dutch Official Summary

Terwijl Ash en Brock trainen voor de Pokémon League, ontdekken ze een verborgen tempel vol Pokémon fossielen. Misty vertelt over een stad waar mensen tempels bouwden voor hun Pokémon. Zou dit de oude stad Pokémopolis zijn?

French Official Summary

Tandis que Sacha et Pierre s'entraînent dur pour la Ligue Pokémon, ils découvrent par hasard un temple secret contenant des fossiles Pokémon.

German Official Summary

Während Ash und Rocko mit dem Training für die Pokémon-Liga beschäftigt sind, entdecken sie zufällig einen verborgenen Tempel mit Pokémon-Fossilien.

Danish Official Summary

Ash og Brock træner til Pokémon Ligaen, men opdager et skjult tempel fuld af Pokémon-fossiler. Misty erindrer en skjult by, hvor folk byggede templer til Pokémons ære. Er de mon stødt på den ældgamle by Pokémopolis?