Pokemon the Series: Ruby & Sapphire Season 601 Episode 10 You Said a Mouthful!

When Ash discovers a sign announcing "The World's Most Powerful Pokemon," he is unable to resist challenging its Trainer, Anthony, to a battle. The Pokemon in question turns out to be a Pelipper, who wins easily by using attacks it shouldn't be able to use. After Ash and the others leave, Team Rocket challenges Anthony and discovers his secret: he's hiding Poke Balls inside Pelipper's enormous bill! With Team Rocket pulling the strings, Anthony continues to take on all challengers, but this time the villains get to keep every Pokemon they defeat! After landing quite a haul, Team Rocket challenges Ash--but they've loaded up poor Pelipper's bill with so many Poke Balls that they overflow. Team Rocket is defeated, the stolen Pokemon are returned, and Anthony decides that he'd rather make Pelipper the world's most powerful Pokemon through honest training!