Ash and his friends continue toward Castelia City and Ash’s third Unova region Gym Battle. On the way, the Egg that our hero has been carrying finally hatches into...a Scraggy! Everyone wants to greet the newly hatched Pokémon, but the feisty Scraggy decides to say hello with a Headbutt instead!
Scraggy seems to be a loner, choosing to eat by itself rather than join the group for dinner. That night, our heroes wake up to discover that Scraggy has wandered off. They finally find it practicing its Headbutt against a tree where a group of menacing Galvantula live! Scraggy shows great courage and tries to stand up to them despite being outnumbered. That’s when Ash and his friends come to the rescue: Pikachu’s powerful Thunderbolt sends the Galvantula back into their tree, but not before Scraggy takes a paralyzing hit from one of its angry opponents.
Iris whips up some herbal medicine for Scraggy, and after a good night’s sleep, the Pokémon starts to feel better. Scraggy finally calms down enough to settle into its new Poké Ball, becoming the newest member of Ash’s family!
Meanwhile, Team Rocket—Jessie, James, Meowth, and the new agent Pierce—have brought the stolen Meteonite to a researcher named Dr. Zager, who examines it and determines that it’s the real thing. It’s off to begin the second part of their evil plan...
While the group takes a break on the way to Castelia City, Ash admitres his newly won Basic Badge, and musing to Pikachu that he only has six left to earn. Axew wanders over to the backpacks, and takes interest in at Ash's Egg, when it suddenly begins to shake and glow. Axew is so startled that he falls over backwards, and then excitedly draws everyone's attention to the Egg. Cilan mentions that the glowing means that it will hatch soon and Ash wonders what kind of Pokémon will hatch from the Egg. Iris tells Axew that he is going to be a big brother, which makes Axew even more excited, so much so that he accidentally trips, and sends the Egg rolling down the hill. Everyone chases after the Egg, trying to catch it before it crashes into a sharp rock at the bottom of the hill. Ash tells Pikachu to use Quick Attack, and he manages to grab the Egg in time. Iris and Axew apologize to Ash, and Ash replies that everything turned out okay. Then the Egg begins to glow again, and finally hatches into Scraggy. Cilan mentions that it is a Scraggy, and Ash scans it with his Pokédex. Ash and Pikachu introduce themselves to their new friend, to which Scraggy responds with a Leer attack. Then Scraggy tries to Headbutt Pikachu, which Pikachu dodges. Noticing Scraggy's aggressive nature, Ash suggests that if Scraggy truly wants to battle that much, then he and Pikachu will battle as a way of introducing themselves.
Ash then uses his Pokédex to find out what moves Scraggy knows, finding out that it only knows Leer and Headbutt. When Iris reacts with surprise, Ash reminds her that Axew only knows Scratch and Dragon Rage. Ash then calls for a Leer attack from Scraggy, which Cilan notes has little effect. Then Ash calls for a Headbutt attack, which also has surprisingly little effect. Finally, Ash calls for a Thunderbolt counterattack from Pikachu, but a weakened one, which totally knocks Scraggy back. Ash asks Scraggy if he is okay, and he gets up, still ready for battle. Cilan is surprised that he can still go on, but Ash notes that with the fighting spirit that Scraggy has, he was born to battle. Iris comments to Axew that he has a troublesome baby brother, to which Axew agrees.
Ash then calls out his other Pokémon in order to meet their new friend. They all respond in a positive way, starting with Pidove. However, Scraggy continues to respond aggressively, Headbutting Pidove, which shocks her. Oshawott is next, but again, gets a Headbutt from Scraggy, which results in Oshawott getting so angry that Pikachu and Tepig have to pull Oshawott away from Scraggy. However Scraggy Headbutts Oshawott again, separating him from his scalchop, and stepping on it so that he cannot get it back. Oshawott yanks his shell back, and smacks Scraggy over the head with it, to which Ash asks if Scraggy is okay. Oshawott responds with a Water Gun attack, to which Scraggy defends himself by pulling up its "pants" to block it. Ash notes that is how Scraggy defends himself. Scraggy then Headbutts Tepig, which makes him dizzy. He tries to Headbutt Snivy, who is sitting on a rock, but Snivy easily dodges, and Scraggy hits the rock instead. He then shakes off the dizziness and approach again, to which Snivy responds by using her Vine Whips to hold Scraggy at bay, until he trips and falls on his face. Ash asks Scraggy if that is enough for now, to which Scraggy responds by Headbutting Ash.
Meanwhile, Team Rocket are still in Nacrene City awaiting further orders. They contact Pierce via a laptop, and he orders them to their next rendezvous location, a building on the other side of town, and tells them not to be late.
It is now evening, and group and their Pokémon are gathered around eating dinner. Ash invites Scraggy to join them, but Scraggy refuses. Iris observes that it is hard to know what Scraggy is thinking, and Cilan suggests that it might be upset that it lost to Ash's other Pokémon. Ash asks Scraggy if that is true. By nightfall, Scraggy comes out from hiding, and Ash is excited that he finally is eating his Pokémon food. Then Ash says that it is time for Scraggy to go into a Poké Ball, which upsets Scraggy again. Cilan observes that since it just hatched, it might want to stay in the outside world for a little longer. Later on, everyone is asleep. Axew sleepily pokes his head out of the sleeping bag that he and Iris are sharing, and notices Scraggy sitting on a rock, looking at the moon and stars. When Scraggy notices Axew, he quickly withdraws back inside the sleeping bag. When he pokes his head out again, Axew notices that Scraggy is gone. Axew jumps out of the sleeping bag and looks around for Scraggy, then wakes up Iris, who wakes the others. The search begins, and soon Axew notices Scraggy's footprints which leads to a distant tree.
When the group arrive at the tree, they find Scraggy, but a wild Galvantula soon follows. Iris identifies it, and a very scared Axew dives into her hair to hide. Then Ash looks up Galvantula on his Pokédex. Iris and Cilan both agree that this is bad, and Ash and Pikachu leap into action to save Scraggy. Scraggy is paralyzed with fear at first, but then tries a Headbutt attack. Everyone is shocked that Scraggy would make such a reckless move, but Galvantula hits him with an Electro Ball attack. Then Galvantula launches an Electroweb attack, and follows up with a Pin Missile attack, both of which hit for massive damage and send Scraggy flying backwards. Ash catches Scraggy, and when he sees that Galvantula is charging up another Electro Ball attack, he orders a Thunderbolt attack from Pikachu, which hits Galvantula, and drives it back into hiding in the tree. Ash asks if Scraggy is all right, and Cilan observes that it did suffer direct hits from Galvantula's attacks. Scraggy attempts to stand up and walk, but it is far too weak, and it is paralyzed. Ash asks if there is a Pokémon Center nearby, but Cilan responds that nothing shows up on his map. Iris says to leave this to her, so her and Axew jump into the bushes to look for medicinal plants to heal Scraggy. Iris soon finds the ingredients and mixes up the medicine for Scraggy back at camp. Ash feeds it to him, but it does not taste very good. Iris prescribes a good night's sleep, and Ash tells it to take a nice rest.
Meanwhile Team Rocket have reached the rendezvous point. With a light signal in hand, James waves down an approaching helicopter. The trio quickly board the aircraft, which then takes off again. Inside, the trio is met by Pierce, who explains that the helicopter is Team Rocket's mobile laboratory. He then introduces Dr. Zager, who asks to see the Meteonite that the trio stole from the Nacrene Museum. James hands it over, and Dr. Zager begin his analysis immediately with a laser machine. Dr. Zager concludes that there is no doubt, that the material that the Meteonite is made of the world. The laser then changes to a red color, and the Meteonite begins to glow a bright purple color. Dr. Zager remarks excitedly that this is exactly the reaction he had been hoping for, and orders that he needs to analyze the Meteonite further. Then Pierce says that they should head to the location of their next operation, to which the trio responds in the affirmative, and the helicopter flies off into the distance.
The next morning, Scraggy awakens, surrounded by Ash and friends. Ash is glad to see that Scraggy is feeling better, and he asks Scraggy to thank Iris and Axew for the medicine. However it rushes off again, returning to the tree where the Galvantula was the night before, and begins to Headbutt it. This time, a whole colony of Galvantula are awakened. When Axew sees this, he is alarmed, and returns to camp to get the others. Back at camp, Axew tells the others what has happened. Arriving on the scene, Ash calls out the rest of his Pokémon to save Scraggy. Pidove uses her Air Cutter, Tepig attacks with Ember while Oshawott strikes a different Galvantula with a Razor Shell. Then Snivy uses her Vine Whips to yank Oshawott out of harm's way of a Galvantula that was about to land on him. She then uses her Leaf Storm attack on the same Galvantula. Then Pikachu uses Thunderbolt on all of the Galvantula, driving them back into hiding in the tree. Ash asks if Scraggy is all right, to which it responds in the affirmative. Ash thanks all of his Pokémon for all of their hard work, then he warns Scraggy not to go under that tree anymore. Cilan proposes that maybe Scraggy was trying to get his revenge. Iris says she is glad Scraggy is safe. Then Ash says that they should all eat breakfast together.
Back at camp, everyone is eating breakfast together, when Axew tries to bring his food over and eat with Scraggy. Though Scraggy turns his back on Axew, and they start glaring at each other. Ash and Iris tell them not to fight. Then Cilan suggests that Scraggy might be the perfect partner for Axew's battle practice, which Ash and Iris agree to. Iris encourages Axew to do his best, and Ash encourages Scraggy not to lose. Then Cilan, acting as referee, call for the battle to start. Ash calls for a Leer attack to start things off, which is successful. Then Ash orders Scraggy to use Headbutt, which is also effective. Iris orders Axew to counterattack with Scratch, which is a hit. Iris congratulates Axew, then orders him to use Scratch repeatedly, which all hit their mark. Ash orders Scraggy not to give up, and calls for a Headbutt attack, which sends Axew flying backwards. Axew repsonds by charging up a Dragon Rage, which collides with Scraggy’s oncoming Headbutt, to which a huge explosion ensues. When the smoke clears, both Axew and Scraggy are unable to battle. Iris remarks that Dragon Rage failed again. Cilan suggests that they call it a draw for today. Ash agrees, then offers Scraggy the chance to become stronger together, to which Scraggy agrees. Then Iris says the same thing to Axew, who also agrees. Cilan remarks that means that both Pokémon are worth raising, and that he is looking forward to them maturing. Then Ash says that Scraggy should take a long rest, and catches him in a Poké Ball.