You Said a Mouthful! (Japanese: 史上最強のぺリッパー現る！！ The Greatest Pelipper Show in History!) is the 10th episode of Pokémon: Advanced.
While Ash and Co. continue their journey, they meet Anthony and his Pelipper, which is said to be the world's most powerful Pokémon. The reason is that his Pelipper knows, and type moves instead of only and type moves. How is Ash going to defeat Pelipper, and what are Anthony's Bellsprout, Magby, and Magnemite doing in Pelipper's mouth?
The heroes arrive at Rishin Town where they see a sign that there is a Gym with the world's most powerful Pokémon, so they go there. Before they arrive, a man rushes outside, saying he lost to the world's most powerful Pokémon. Ash is tempted to challenge the trainer, so they arrive to the battle field where Ash challenges the trainer to a battle. He introduces himself as Anthony, who promises to give a great battle. The Pokémon with Anthony is Pelipper. Anthony tells Ash his gym is unofficial, as he has no badges to give out. Anthony says that Ash can use as many Pokémon as he wants, so Ash brings his Treecko out first. Max explains to May that Pelipper can use only Water and Flying attacks. Pelipper uses Wing Attack, but Treecko dodges the attack. Pelipper uses Vine Whip, much to everyone's shock. Treecko attempts to dodge the attack, but fails. Treecko is tossed away and defeated, so Ash sends out his Taillow.
Taillow attacks with Peck, though Pelipper uses Flamethrower. Taillow is defeated, so May thinks Max should study more, who is freaking out, as Pelipper cannot use those attacks. Ash sends his ace, Pikachu, to battle. Before attacking, a glow appears in Pelipper's mouth. Both trainers order to use Thunder attack, making a huge blast. Both Pelipper and Pikachu are injured and cannot fight. Anthony leaves, while the heroes go to the Center to heal Pikachu. Team Rocket appears and they saw the battle. They plan to capture Pelipper, but remind themselves that Pelipper is the most powerful Pokémon in the world, to which they need a more powerful one to capture the Pelipper. Jessie reminds them that they are Team Rocket and they need to steal it, ordering James and Meowth to make a plan. Anthony takes care to Pelipper, but Team Rocket is flying in their balloon and intimidating Anthony.
Pelipper flies to strike, though Team Rocket puts special outfits on to protect themselves. Pelipper uses Vine Whip - making Team Rocket use a robot arm to grab the vine. However, catching the vine reveals that a Bellsprout was in Pelipper's mouth. Anthony orders Flamethrower, Thunderbolt and Water Gun, so Meowth thinks Pelipper is having an identity crisis. Everything in Pelipper's mouth is moving, making him attack with Water Gun, Flamethrower and Thunder all at once. Pelipper is caught, revealing Magby and Magnemite hiding in its mouth as well. James and Meowth condemn him, but Jessie thinks it is genius. Anthony tells he only wanted the world's most powerful Pokémon. Team Rocket orders him to give them the Pelipper, so they can do whatever they want with it, or else they will reveal the truth. Anthony tells it to obey them, making Pelipper uncomfortable.
At the Pokémon Center, Max still wants to know how the Pelipper could perform those attacks. May tells that what is studied is not the same as reality, but Brock wonders how Pelipper was able to use that many attacks. Ash's Pokémon are healed. May takes Ash to another room, where the trainers who fought Pelipper lost and had to give their own Pokémon. Team Rocket persuade others to fight their Pelipper. A trainer comes and brings his Zigzagoon out to fight, though Pelipper uses Razor Leaf, Thunder and Flamethrower to defeat it. The gang is coming to investigate, so Meowth warns Jessie and James. Jessie and James place more Poké Balls into Pelipper's mouth, even placing Meowth inside, for he could direct which Pokémon to send. The heroes appear and encounter Pelipper. Jessie and James claim Anthony abandoned it, but the heroes do not believe such a fact.
Ash sends Pikachu, wanting to rescue everyone's Pokémon. Pelipper (with Bellsprout inside) uses Vine Whip, which Pikachu dodges. Pelipper uses SmokeScreen (with Magby inside) and Razor Leaf (with Bellsprout inside). Pelipper (with Magby inside) uses Flamethrower, while Max goes inside the building, finding Anthony tied. Anthony and Max arrive to the battle. Meowth develops a strategy to defeat Pikachu, soaking it and electrocuting it, so he orders Pelipper to use Water Gun. Accidentally, it hits everyone, even Jessie and James, unmasking them. With Pelipper using Water Gun, it releases every Poké Ball inside its mouth. Anthony uncovers his secret, but Team Rocket departs with the Poké Balls. They fly off in the balloon, but Pelipper cuts the rope tied to the bag with Poké Balls, with the heroes catching the bag.
Team Rocket puts on their anti-electricity suits. Pikachu attacks with Thunderbolt, but the attack is deflected. May develops the same strategy as Meowth did - Pelipper uses Water Gun on the balloon, with Pikachu attacking with Thunder. Team Rocket blasts away. The Poké Balls are safe, though the heroes admit Anthony could train Pelipper to get stronger. Anthony promises to train Pelipper "the right way", while the heroes leave to Rustboro City.
- "Now put your heads together and come up with a plan." - Jessie to James and Meowth
"Who's that Pokémon?": Unown