The group continues towards Blackthorn City, and Ash returns to his human self after being turned into a Pikachu by Lily's spell. Now one issue is solved, but Misty is furious to learn that they are once again lost in a forest. Ash manages to settle Misty before Team Rocket appear disguised in an orange and purple tuxedo. James removes the white cloth covering the PikaPower Mach II, a machine designed to restore electricity of tired Electric Pokémon like Ash's Pikachu. Jessie then rips Pikachu off Ash's shoulder and straps him in. Next, she radios in Meowth who swoops down in the balloon and takes Pikachu, Jessie, and James into the sky. As they ascend, Jessie and James remove their disguises to reveal themselves. Jessie then tells Ash to command Pikachu to use Thunderbolt. But the energy is absorbed into Team Rocket's machine, which also has the power to forcibly drain its victims of energy. Team Rocket threatens to sap all of Pikachu's power if Ash doesn't hand over the rest of his Pokémon, but Ash simply tells Pikachu to give it all he's got. Soon enough, Pikachu's power overloads the machine and Team Rocket goes blasting off. Ash happily catches Pikachu, but the power drain has left him exhausted.
Just then, a girl named Krystal approaches the group. Brock instantly falls in love with her at first sight. However, Ash goes on to tell her that Pikachu is badly hurt and that there isn't a Pokémon Center for miles around. Krystal offers to help but asks them to keep a very big secret for her in return, and the group agrees to the request. She leads them up a large hill. As they walk, the group notices numerous Electric Pokémon climbing up the hill - Krystal tells them that they're all going there for a special reason. When they get to the top of the hill, they find a big lake, which Krystal claims has magical healing powers; the Electric-types come here to rest and recharge. She then orders Ash to put Pikachu into the water, and the Mouse Pokémon is soon good as new. After Pikachu is healed, Krystal takes Ash and his friends out to the middle of the lake in a speedboat to show them the secret to the lake's power. When they look down from the bottom of the boat, they see what looks like an underwater temple with a crystal at the bottom. Krystal informs them that the Electric Pokémon have been coming to the lake for years. She explains that according to legend, the temple sank into the water after torrential rains.
Unknowingly, Jessie, James, and Meowth are eavesdropping on the conversation and plot to steal the legendary crystal to become instantly rich. The evil trio put a plan into motion, and use a large mechanical Tentacruel. They retrieve the crystal with little difficulty, but its light suddenly fades out, alerting Ash and his friends that something's up. The Team Rocket trio reveals themselves, reciting their motto before floating away in their balloon. As our heroes fume over this occurrence, the Electric Pokémon start to follow Team Rocket in an attempt to get the crystal back. Ash orders Pikachu to Thunderbolt them, and the other Electric Pokémon join in on the attack. However, Team Rocket sucks in their energy with the new and improved PikaPower Mach III. Gloating that their new machine is better than ever, the villains begin forcibly drawing energy from the Electric Pokémon, but black clouds appear in the sky, followed by a mighty screech and a huge bolt of lightning that breaks the circuit between the Electric Pokémon and the machine.
As everyone wonders what this means, the sky darkens and the clouds part to reveal the Legendary Bird Zapdos. In a rage, Zapdos flies towards Team Rocket to zap their PikaPower Mach III. However, even Zapdos loses energy and the group starts to wonder why it doesn't seem to have much power in the first place. Team Rocket gloats, but Zapdos unleashes its full power and overloads the PikaPower Mach III, sending Team Rocket blasting off again. But then Zapdos falls out of the sky to the ground. Still angry and flailing about, it finally faints.
Krystal tells the group that this is the real secret - Zapdos itself often visits the lake to recharge itself. Needing the crystal to heal Zapdos, Ash and his friends set off to find Team Rocket and the crystal. Pikachu senses the crystal is nearby, so they follow it to where Team Rocket had crashed. In an attempt to keep the crystal for themselves, Team Rocket sends out Arbok and Victreebel - although James again has to deal with the latter attempting to eat his head. Jessie orders Arbok to use Poison Sting, but Ash's Pikachu dodges and uses Quick Attack. With Arbok thrown into Jessie by the force of the blow, James orders Victreebel to use Razor Leaf - however, Ash tells Pikachu to use Quick Attack again, hitting Victreebel into its Trainer. Ash demands that Team Rocket hand over the crystal, but Jessie instead throws Ash a Wobbuffet balloon, which inflates and bursts. Under cover of the resulting dust storm, Team Rocket makes a getaway in a new Wobbuffet balloon - in response, Ash sends out Bayleef and orders her to use her Vine Whip. Seeing the crystal being pulled from the balloon, James orders Victreebel to use its Vine Whip to get the crystal back. As the Grass-type types struggle to break each other's grip on the crystal, Jessie orders Arbok to use Poison Sting. However, Pikachu uses Thunderbolt to blast Team Rocket off again, the crystal falling from their grasp. Running to catch the crystal, Ash dives off a cliff. Luckily, Bayleef catches Ash in time with her vines.
With the crystal secure, Ash and his friends return to the lake, where Ash dives underwater and places it back in its rightful place. He resurfaces, but the crystal remains dark. Pikachu and the other Electric Pokémon are determined, so they swim over to the crystal and use their attacks to charge it up. The crystal's mystical blue glow returns once again. The group puts the injured Zapdos into the lake, where it sinks to the bottom - however, the crystal stops glowing before it can heal the Legendary Bird. The Electric Pokémon charge up the crystal again, which helps power up Zapdos as well. Fully recharged, Zapdos rises out of the water, releasing a mighty Thunderbolt that completely restores the crystal's glow. With the lake back to normal, Zapdos flies off into the distance as everyone waves goodbye.
Ash and his friends are then shown ready to leave, promising Krystal that they won't tell anyone about the lake or Zapdos. Brock makes a last attempt to woo her, but Misty pulls him away by the ear before the group continues on their way. Elsewhere, Team Rocket are clinging onto each other as they hang from a cliff. Zapdos soars passed them and delivers an electric shock.