Mother of All Battles (Japanese: バンギラスとヨーギラス！Bangiras and Yogiras!) is the 264th episode of the Pokémon anime. It was first broadcast in Japan on September 5, 2002 and in the United States on September 15, 2003.
Now that they have finally gaining Larvitar's trust, the group head towards the Pokémon Reserve on Mt. Silver, as led by Larvitar. While crossing the bridge onto the reserve, the group does not realize they are being watched by three poachers, Braggo, Blurt, and Chico, who are inside a submerged submarine!
Ash, Misty and Brock come across a roar in the distance, which belongs to a Tyranitar. Brock notices its scar, which matches the scar from Larvitar's dream, proving that this is indeed its mother. When Ash nudges Larvitar over to meet its mother, Tyranitar misinterprets the gesture and fires a Hyper Beam right at them! It believes Ash, Brock, and Misty are the original poachers, and chases after them in a fit of rage; the problem is enhanced by Larvitar, as it refuses to leave Ash behind! Larvitar's Screech snaps Tyranitar out of it, as it realizes that Larvitar is its baby, and that Ash, Brock, and Misty pose no threat. The threat arrives soon after, as the poachers return, trying to capture Tyranitar by trapping it in a Pokébag! Ash recognizes the poachers from Larvitar's dream, and immediately tries to get Tyranitar back.
When the poachers hear Ranger Mason approaching, they trap Ash in one of their bags and head off. Brock calls out Crobat to follow them, while charming up Ranger Mason. Mason informs them that they took the wrong road, as had they have not crossed the bridge, they would have made it right to the Preservation Center. As they work on finding the poachers, Team Rocket beat them to it and ask Braggo if they can join them. Braggo accepts, giving Jessie and James the packing machine in order to draw attention elsewhere, leaving an opportunity to escape with Tyranitar.
Crobat reports back to Brock, giving Ash and crew an idea of where the poachers are hiding, but come across Team Rocket instead. Pikachu and Croconaw work together to redirect their attack, blasting Team Rocket off, while the poachers activate their poaching machine by remote to grab Croconaw and Pikachu! Larvitar uses its Screech to awaken Tyranitar, who uses its Hyper Beam to break their remote control. The bags break, freeing Tyranitar and the others, while a combined attack from Tyranitar and Larvitar destroy the machine, and free Pikachu and Croconaw.
Ranger Mason thanks Ash and friends for the help catching the poachers, but Ash puts the thanks all on Larvitar's head. Finally reunited with its mother, Larvitar remains at the Reserve, while Ash, Misty, and Brock head towards Silver Town!
As Ash and his friends continue towards the Mt. Silver Pokémon Preserve to return Larvitar to its home, they stop as Brock tries to catch his breath. Meanwhile, Misty marvels at Larvitar's improved confidence as the young Pokémon is happily being carried in Brock's arms. Brock is unable to read his guidebook's map for directions to the Preserve, though Larvitar leaps out of his arms and rushes over a nearby rope bridge. The group follows, deciding that it's leading them to it birthplace. While everyone is crossing, a periscope rises from the water, watching them. On the other side, Larvitar is cheerier than usual as it guides everyone through a forested area. In the bushes, a machine is hidden with the same periscope aimed at them. Inside are three men, who decide to steal Larvitar after spotting it walked passed.
The group stops walking after hearing some loud noises. The growls continue to get closer and the ground begins to shake, until a huge Pokémon appears in front of them. Ash holds up his Pokédex and learns that they have encountered a Tyranitar. The group notices a familiar scar on Tyranitar's chest, and realize that this must be the very Tyranitar they saw in Larvitar's dream. Brock declares that the Tyranitar must be Larvitar's mother. Tyranitar looks endearingly at her child. Unfortunately, she gets upset when Ash tries to push Larvitar forward and fires a Hyper Beam at the group. Brock realizes that she probably thinks they are the poachers. They run away, leaving Larvitar with its mother. Ash looks back and sees Larvitar crying and running behind them, despite Ash telling it to stay. Larvitar ignores the group’s pleas and grabs a hold of Pikachu’s tail. Tyranitar fires off another Hyper Beam as Ash and his friends continue to flee. Ash eventually drops Larvitar and Tyranitar looks at it curiously. Larvitar lets out a mighty Screech. Tyranitar suddenly realizes that Larvitar is her child and apologizes to Ash and his friends.
Just then, the periscope locks on to Tyranitar. Following Braggo's orders, Chico fires a giant Pokébag, which wraps around Tyranitar and causes her to hit the ground. A bag wraps itself around her and she falls down. The machine rides out and the three men emerge to marvel at their grand catch. The group instantly recognizes them as the poachers from Larvitar's dream. They introduce themselves as Braggo, the leader who always speaks in rhyme and quotes, Chico, the inventor for the group, and Blurt, who calls himself the strong and silent type who always breaks things and talks a lot. They declare that they are the Pokémon Poacher Brothers. Meanwhile, Team Rocket flies over the area in their Meowth balloon and watches everything through their binoculars. Jessie remarks that the poacher brothers' routine was unoriginal. James is discouraged by the fact that the poachers have good equipment, and can make rhymes. Jessie makes a terrible rhyme furthering James’s point. Jessie states that if they can’t beat them, then they will join them, steal their equipment and Pokémon, and leave. Meowth and James agree.
Braggo is pleasantly surprised to learn that Larvitar is the very one they stole when it was just an Egg, and the poacher trio thank Ash for returning it to them. The poachers launch another Pokébag at Larvitar, but Ash jumps in the way and is caught instead. After hearing sirens, the poachers decide that Tyranitar is good enough and drive away. Brock sends out Crobat to follow them. A few seconds later, a lady rides up on a motorcycle and asks if everything’s okay. Brock rushes up and says that everything is okay now. She says that she’s Ranger Mason and that the poachers have been bothering them for quite some time. She has her Croconaw get Ash out of the capture bag. Ranger Mason informs the group that they would have reached the Preserve if they had simply stayed on the road. Ash notices that Larvitar is feeling down and he promise that they will get its mother back. Ranger Mason crouches down to assure Larvitar, but this startles it. Misty and Brock inform her that Larvitar takes a while to warm up to people.
Meanwhile, Team Rocket are begging to be accepted into the poachers' gang. Braggo and his brothers feel cricks in their necks and suggest the Rocket trio gives them a massage each. Team Rocket's incredible obedience helps them get accepted into the poaching troupe. However, Crobat peeks over the side of the robot and flies back to inform Brock. Braggo lets Team Rocket use the robot to capture Larvitar and Pikachu. Jessie and her teammates are overexcited about their upgrade, but they are unaware that Braggo is using them as cover while he and his brother's make their escape. Tyranitar struggles in her capture bag. Chico laughs, saying that the more she struggles, the tighter the bag will become.
Crobat finds Brock and reports back, and soon after the poachers’ robot zooms down a hill towards them. Team Rocket pops out and recites their motto. However, Mason and the others are confused. Jessie explains that she and her teammates are now aligned with Braggo, and then fires a Pokébag. Pikachu uses Thunderbolt and Croconaw uses Hydro Pump that sends the bag back at Team Rocket and sends them blasting off. The real poachers, however, are getting away in Team Rocket's balloon. Chico uses a remote control to control the mecha. It grabs Pikachu and Croconaw, and then shoots a bag at the group for good measure. Ash tells Larvitar to use Screech, and the ear-splitting sound distracts the poachers and makes Tyranitar angry. She fires a few Hyper Beams at the bag. Chico presses a button on a remote to electrocute Tyranitar, but despite the pain, she bites through and fires a Hyper Beam at the balloon. As the poachers plummet towards the earth, Chico drops the remote which breaks into pieces after it lands on the ground, freeing the humans from the bag. As Larvitar is reunited with Tyranitar, they see the banged-up poachers jump into their robot. As the robot is about to crush everyone, Tyranitar and Larvitar launch a Hyper Beam and Hidden Power respectively. Ash catches Pikachu while Croconaw lands on Brock. Afterwards, Larvitar and Tyranitar hug.
Ranger Mason thanks the group for helping her catch the poacher brothers, who are now tied up together. Ash tells her that Larvitar is the real hero, and she crouches down to thank it. This time Larvitar doesn't seem afraid and smiles back in appreciation. Mason declares that Larvitar has gained more confidence. Brock adds that he has also developed more confidence and grabs a hold of Mason's hands, but Misty drags him away by the ear for his troubles. Later Ranger Mason instructs the group to follow the river road, which will get them directly to Silver Town. As they farewell Mason, Larvitar, and its mother appear to say their goodbyes to the group as well. Meanwhile, Team Rocket remains bundled up together in a bag and can only struggle as they hang precariously from a rope bridge.
James expresses jealousy that Braggo is able to speak in rhyme, and Jessie tries unconvincingly to demonstrate her ability to rhyme. This is ironic, because Team Rocket's rhymes and puns are a running gag.
In the Spanish dub, Braggo is heard saying "Time to cash in your chips" in English.
Also, in the Finnish dub, both the Finnish and English voices of Braggo are heard simultaneously during this line. The same error appears in the Polish dub.
Also, in the Polish dub, the Polish and English voices of Braggo are heard simultaneously during the line "Run today to fight another day."
In the Swedish dub, when the Pokémon Poaching Brothers are leaving with Tyranitar before Brock calls out Crobat, the sound of Brock throwing the Poké Ball and it opening can be heard instead of the machine leaving.
In the Norwegian dub, there is no background sound.
After Crobat reports back to Brock and his friends, it disappears for the rest of the episode, as Brock is never seen recalling it back in its Poké Ball. However, he could have done it off screen.
In one scene, Pikachu's voice can be heard, but his mouth does not move.
In another scene the opposite is true for Croconaw, as its mouth moves, but his voice can't be heard.
Brock once refers to Larvitar's mother as a male.
When the remote broke to pieces, Ash and company were able to break free from the bag. But Team Rocket Trio, who had also been captured in the bag, was not freed, as is evident from the end of the episode.