Ash's Saga Chapter 2
As Ash, Brock, and Misty approach the Jhoto League, Ash is hyped up to win, just like how he did against Ritchie in Kanto.
Misty: Ash, don't get this victory over your head.
Brock: That's right, Ash. Overconfidence will only lead to your downfall.
Ash: Yeah…Thanks, Misty. Thanks, Brock.
They reached Silver Town, where the Silver Conference is. Ash registers, but the League starts the next day. Outside of town, Ash begins a training session, which lasts for the rest of the day. When his Pokémon seem ready to fight tomorrow, Ash and the others sleep in a nearby hotel.
The next day, the Jhoto League starts. Suddenly, Misty sees a tower that wasn't there earlier. What she doesn't know is that the tower emits electromagnetic waves. As a battle starts, those waves prevent the Trainers from sending out their Pokémon.
Since Ash wasn't battling, he and his friends investigate the tower. Inside the tower, they went through all of the steps (despite having an elevator) to end up finding Sabrina on top.
Ash: SABRINA!!
Sabrina: …
Ash: The tower is interrupting the tournament. Shut down whatever's causing this.
Sabrina: NEVER!
Sabrina sends out her Jynx, but Pikachu eventually beats Jynx. She flees and Pikachu destroys the tower. When the heroes came back, for some reason, everyone thanked Ash and allowed him to have the trophy. Once Ash has the trophy, he and the others wait a while there.