It's the 300th episode spectacular, just kidding. Wile Ash preps up for his rematch with Brawly, Corphish pinches the ears of a Loudred, causing it to scream. Corphish, along with Pikachu, Silcoon, Torchic, Lotad and Mudkip get lost and soon they encounter a tribe of Nuzleaf. Can Ash and co. find their Pokémon before it's too late?
Ash has finished his training, so the gang ventures inside the cave. Ash's Corphish goes inside a tunnel and pinches a Loudred's ear, making it screaming in pain. Brock's Forretress uses Rapid Spin to make an opening in a wall for everyone to escape, but May loses her Silcoon, so Pikachu and others go to find it. Loudred digs a hole to escape, making Ash, Brock, May and Max free of its sound, but they wonder where have their Pokémon gone to.
Pikachu finds Silcoon, but cannot grab it, so Corpish goes to grab it, but they all fall down the river. The stream gets them to a waterfall and they fall down, but trees make their fall much softer, except for Corpish who stuck in the ground. Pikachu tries to free it, but Treecko pounds Corpish with its tail, setting it free. Corphish takes that as an insult so they argue, but Pikachu and Mudkip tries to calm them down. Treecko and Corpish then calm down, shaking their hands and claws. They go to find their trainers.
Taillow and Forretress are the only Pokémon left with the gang, s they go to search for their missing Pokémon. Team Rocket explores the tunnels, thinking one of them has something to get them out of the cave, but nobody has thought of it. Jessie's Wobbuffet leaves its Poké Ball, standing on a Loudred. The Loudred awakes and uses sonic attacks to blast them off.
The Pokémon continue the search, but Corphish finds some mushrooms to eat. Pikachu stops him, warning him that he'll get poisoned if he ate them. Mudkip finds some other fruit to eat. Corphish eats the cherries, but he cannot swallow them, so Treecko pounds him so he may drop the remaining one. While they go, a Nuzleaf is looking over them. The Pokémon get tired when the Nuzleaf sings. Treecko realizes they have been walking in a circle and see the Nuzleaf laughing.
Treecko attacks Nuzleaf, but it dodges. Corpish attacks Nuzleaf as well, but the leaf on its head has been cut, so he calls for some backup. The gang searches for the Pokémon and the Pokémon its trainers. Corphish sees some fruit tied to a rope and he grabs, but he is grabbed as well. Lotad relaxes in water, but he is captured. Treecko looks behind to see where others are, but even he is captured. Torchic stops to look at some beautiful flowers, but gets captured. Pikachu stops to hear, but a Nuzleaf takes the Silcoon.
Taillow has found Pikachu and Mudkip running. The others have been captured by Nuzleaf, being to be torched by flames the Nuzleaf are making. Treecko pounds the cage to get them free. Corpish uses Crabammer, but even that isn't helping. Team Rocket see the situation and see Pikachu and Mudkup arrive. Mudkip tries to reason with Nuzleaf, but they get captured by Team Rocket, along with Pikachu.
The Nuzleaf and Pikachu attempt to get free, but no use. Mudkip tries to get the others free using Water Gun, but it fails to do so. Forretress uses Rapid Spin and Taillow Quick Attack to set them free. Corphish uses Claw Hammer on Ash, making him come to Team Rocket's balloon. Despite the knot, Ash bites it, setting the Nuzleaf free. James brings Cacnea and it uses Pin Missile, but it damages the mechanical arm, setting Pikachu free.
Nuzleaf and Ash's friends use the net that held Nuzleaf, so Ash jumps onto the net, landing safely. Treecko pounds Corphish and Corphish uses Bubble Beam to destroy the balloon. Corpish falls and lands on Treecko's tail. Ash, Max, May and Brock are surprised that Nuzleaf are so welcoming to their Pokémon.
- Featured Pokémon: Treecko
- This episode is a milestone because it is the 300th episode made.