The Bug Stops Here (むしとりたいかい！しぜんこうえんでゲットだぜ！！ Debugging Conference! Get It at the National Park!!) is the 4th episode of Pokémon: Johto League Champions.
The next stop for Ash is Ecruteak City, but before going there he, Misty and Brock run into Casey, who plans on entering the Bug-Catching Contest. Ash decides to enter, but Misty refuses (for obvious reasons). Will Ash be able to catch a new bug? Or will Casey win the top prize?
The heroes stop at a stand and learn there will be a Bug Catching Contest. The winner gets prizes, so Ash goes to enter, while Misty refuses to. As they wait, their friend, Casey appears and notice her Chikorita has grown stronger. She still supports the Electabuzz team and sings out their new hymn. She has decided to get a Bug Pokémon, but Ash also tells he will do the same, so they propose to give their best to catch one. Team Rocket, on the other hand, are refused to enter, since they are older than 16. Team Rocket wear school uniforms, but the man refuses to give them entrance, so James and Meowth carry him away. Jessie asks if she looks like she is 16, but nobody answers her. James and Meowth tell she looks like a baby and Wobbuffet comes out, so Jessie bashes him away.
Before the Contest, the participants are given Park Balls to capture Bug Pokémon. The Contest starts, while Misty asks if there are any bugs around. Brock tells they could be anywhere, so Misty checks under Togepi. Ash and Pikachu search around and encounter a Weedle. Misty gets scared, since Weedle is on the screen. Pikachu goes to use Thunderbolt, but Chikorita uses Razor Leaf, so Casey captures it. Ash responds to Casey it was his Weedle, but Casey says that Electabuzz Team are always determined to win and will use any chance. Misty asks if the Weedle is gone, but notices Togepi talking to Caterpie, so she bashes her backpack to scare it away. Brock tries to calm her down, but she knows bugs bug her. A Spinarak comes down (with its body smiling), but Misty still bashes her backpack to scare it off. Jessie diguised herself as a bug, while James and Meowth wait to capture the bug that comes, telling her she looks alluring. A Venomoth comes and Jessie tries to charm it, but Venomoth flies off, using Stun Spore to paralyze Team Rocket.
Casey searches for more Pokémon, so her Chikorita tackles a tree, causing Pineco to fall down. Misty thinks Pineco are no bugs, but Brock tells that Pineco are indeed Bug Pokémon, so Misty thinks they dont look bad. Pineco attack, but Chikorita uses Tackle to push them. Ash comes and tells Casey that Chikorita is weak against Pineco (due to their types), but Casey tells that offense is best defense, as her Chikorita uses Razor Leaf. Brock and Misty see Casey has two Bug Pokémon, though Misty wishes Ash catches a bug, even if she hates them. Casey moves, while her Chikorita is exhausted, so Casey inspires it to move forward. Casey finds a Scyther, so her Chikorita uses Razor Leaf. Scyther gets hit, but retaliates, hitting Chikorita. Chikorita tries to fight, using Razor Leaf, which Scyther pushes back. Chikorita goes on Scyther, blinding it. Ash comes and tells Casey it is not fair to Chikorita, since she is pushing it too hard. Casey does not listen to Ash, though her Chikorita gets bashed onto a tree. Pikachu uses Thunderbolt, zapping Scyther. Ash and Pikachu taunt Scyther, who chases them, leaving Casey to catch Weedle. Casey tries to search her Chikorita, but fails. Misty also sees Togepi drifted away.
Togepi visits Chikorita, who is exhausted. Casey finds Chikorita, who goes away. Casey tells quitters are not allowed on this team, but Misty comes and scolds Casey, asking her if a Contest is more important than a Pokémon. Casey tells that Pokémon matter to her, but is told she does not think of that in this Contest. Casey lies down, so her Chikorita comes back to support her, making Casey sad and asks for its forgiveness. Chikorita forgives her, making Brock and Misty pleased, but Misty bashes her backpack when a Paras came down on Brock. Scyther passes by, while Ash and Pikachu find a hive of Beedrill. Ash throws his Park Ball, but a Beedrill pushes the Ball away. Pikachu uses Thunderbolt and Ash throws the Park Ball, catching Beedrill. Ash and Pikachu cheer, but fall in a hole and get into a cage made by Team Rocket. Pikachu uses Thunderbolt, but he electrocutes Ash, since the cage does not conduct electricity. Casey, Misty and Brock follow them. Team Rockett recognize the twerp from the Electabuzz "Losers" and Wobbuffet comes out, so Casey tells they know as much about baseball as Wobbuffet responds.
Team Rocket releases a net, so Chikorita uses Razor Leaf, but fails. Casey sees that the missile Team Rocket will release needs to be hit on a right spot, so tells Chikorita she is with it. Chikorita acknowledges that and evolves into a Bayleef. Bayleef uses Razor Leaf, destroying the missile and setting Ash and Pikachu free. Using Thunderbolt, Pikachu blasts Team Rocket once more off. At the end of the Contest, Ash keeps his Beedrill and receives a Sun Stone. After the Contest, Ash feels Casey would've won if Team Rocket did not interfere. Casey admits she feels as a winner with Bayleef on her side. Before going, Ash, knwoing how she loves yellow and black stripe Pokémon, gives Beedrill away to her. Casey tells she wanted Beedrill and sings the Electabuzz hymn, making the heroes unpleased about it.
- Just after Chikorita evolves, the game music of Pokémon Gold, Silver and Crystal can be heard.
- The "Who's that Pokémon?" in this episode is Cubone.