Poké Ball Peril (Japanese: なんごくポケモンとＧＳボールSouthern Pokémon and the GS Ball) is the 83rd episode of the Pokémon anime. It was first broadcast in Japan on February 11, 1999 and in the United States on January 15, 2000.
After making a crash landing onto Valencia Island, our heroes get directions to Professor Ivy's laboratory where the mysterious Pokéball is being held. Once at the laboratory, Brock realizes that Professor Ivy and her group of scientists are Pokémon breeders just like him! Suddenly Brock begins to feel at home and thinks about staying for awhile to continue his studies on Pokémon breeding.
After the events in the previous episode, Ash and his friends manage to crash-land Team Rocket's blimp on Valencia Island. They get to an outlook and realize that they cannot find Professor Ivy's lab. Pikachu points to what appears to be a Pokémon Center. They go inside and find a Nurse Joy, much like Kanto's Centers, and she gives them the directions to Ivy's lab. They get to the lab and go inside, where they are met by three girls who lead the trio down to the beach. There, a Gyarados comes out of the sea as a woman pets it, shocking everyone with her skill. Gyarados takes her to the shore as one of the girls tosses her a lab coat. She introduces herself as Professor Ivy.
Back at the lab, Ivy shows them the gold Poké Ball. She reveals the inscribed letters on the top of the ball, giving it the name the GS Ball. One of the assistants demonstrates how the ball could not be transported. Ivy also points out how multiple attempts to open it have all failed. Ivy hands the Ball over to Ash to deliver to Professor Oak. Meanwhile, at the airfield, James and Meowth are dismayed by the ruined blimp, but Jessie reminds them that Ash and his friends have a return trip booked. Knowing that it means another shot at catching Pikachu, Team Rocket starts repairing the blimp.
Ivy leads Ash and the others through the outdoor environment, which serves as an extension of her lab. Misty smells the flowers, but is startled after a Vileplume steps out of the bushes. Ash checks his Pokédex and notices the Vileplume has differently colored petals. The assistants rush out a crate of Pokémon food as other Pokémon come out, all possessing an unusual orange coloring. Ivy explains that she has bred and raised all of Valencia Island's Pokémon, and they form an invaluable part of her research into the effect of the tropical climate's effects on Pokémon. Just then, an assistant points out that the Butterfree has not eaten in days despite them offering it different food combinations. Brock samples the food before running off. He returns to smash Berries, pointing out that the taste is important. He sprinkles the solution onto the food, and the Butterfree flies down immediately to eat, amazing Ivy.
Back at the living quarters, everyone is shocked at the amount of disorder there. Brock promptly puts on his gear and goes into a cleaning frenzy, making the place spotless and preparing dinner, much to the pleasure of Ivy and the assistants. Later that night, while everyone sleeps, Ivy and the assistants watch Vileplume mark the area with its pollen. Brock offers them some rice balls as he watches. An assistant notices a Raticate entering the pollen cloud. Ivy rushes in to pull Raticate to safety, in the process exposing herself to the pollen, which weakens her. She orders the assistants to contact the Pokémon Center. At the Center, Joy treats both Raticate and Ivy. Due to her actions, Raticate was not severely hurt and will recover. The assistants show their concerns for Ivy as Brock watches with admiration.
The next day, Ash and Misty prepare to leave, but they notice Brock is not with them. They find him fixing the roof with his Pokémon, and Ivy notes that Brock wants to stay. Brock explains that he can learn about Pokémon at the lab and that they need him more than Ash does. Ash agrees, and he and Misty bid farewell to Brock, Ivy, and her assistants. Later on, Misty notes how different it will be without Brock before bringing up the dilemma about getting back to Pallet Town. Ash brings out the blimp tickets, but Misty quickly reminds him that the blimp was a sham. When arrive at the airfield, they find a brand-new blimp on standby, and a disguised Team Rocket whisks them aboard. The ship takes to the skies as Jigglypuff manages to get onboard.
When Ash and Misty request food, Team Rocket steps out and drops a steel cage to imprison them before revealing themselves. They notice Brock is not with them and tease them about being a couple. Ash orders Pikachu to attack, but Jessie warns that the attack will destroy the entire blimp. Just then, Jigglypuff jumps in and sings, putting Ash and Misty to sleep. Team Rocket quickly grabs parachutes and opens the hatch to escape, with Jigglypuff flying out with them. However, Ash and Misty remain caged and asleep on the blimp without a pilot.
Pokémon senryū summary: Beware of Electabuzz, thunder, fires, and fathers.
Though Professor Ivy said that Pokémon have slightly different coloration in the Orange Islands, only Butterfree's coloration remained consistent in future episodes. All of the other Pokémon seen have had their regular colors in the Orange Islands. Even when a Paras and a Nidorina from Valencia Island appeared in The Power of One, they were normal-colored.
Near the end of the episode, right before Pikachu uses Thunderbolt on Team Rocket, they warn Ash that the blimp is filled with flammable gas, and if Pikachu used an Electric attack, they would explode. This is most likely a reference to the Hindenburg disaster of 1937, when a German zeppelin filled with flammable hydrogen gas exploded and crash-landed while attempting to land in New Jersey, killing 36 people. The cause of the explosion was most likely due to a static electricity build-up that had sparked and ignited the gas.
When Ash and Misty are walking by themselves after waving goodbye to everybody, Misty's ponytail is on the right side instead of the left. When the camera changes to the close up, the ponytail is back on the left.
When saying goodbye, Brock has on his apron, but then is shown with his usual green vest seconds later.
While on the video phone, Professor Ivy has the receiver and so does Professor Oak, but Ash speaks without it. Ash can obviously hear Professor Oak talking too.
In the dub, James calls Ash and Misty a pair of "very romantic creatures" when Team Rocket captures them. In the Japanese version, he teases them that they had decided to "dump that guy" (Brock) and elope.