Pokémon : S3 | E28 – Gettin’ the Bugs Out

As Ash and his friends walk to the Azalea Gym, Misty, posing as a reporter and using her canteen as a microphone, stops and asks Ash how the battle will go. When Ash declares that he will be victorious, Misty points out that it may be a hard match without Charizard on his team. Ash retorts that he still has Cyndaquil to provide him with plenty of firepower.

The group soon enters the Gym, which resembles a forest garden. Misty becomes immediately anxious and soon enough her worst fears are confirmed as a Caterpie dangles in front of her face. She freaks out and runs away only to come face to face with a horde of Metapod. Misty runs again, crouching down to catch her breath before declaring that the Gym is more like a torture chamber. Her criticism is overheard by a boy sitting in a tree. He declares that his favorite type of Pokémon are Bugs and calls Misty ignorant. His comments irritate Misty. The boy asks who Ash and his friends are and Ash announces that he wishes to challenge the Azalea Gym Leader. The boy reveals that he is Bugsy, the Gym Leader, and a Bug-type specialist. Bugsy accepts Ash's challenge, and then asks Ash to help him out of the tree. Ash sets the ladder up and Bugsy climbs down before declaring that he accidentally knocked it because of Ash and his friends' unexpected arrival.
(Source: Bulbapedia)