Showdown in Pewter City

Major events

 * Ash loses to Brock, he later rematches him and wins, but forfeited, Brock gave Ash the Boulder Badge anyway.
 * Brock joins the group.
 * The K-ON! characters also join the group.
 * Liam's Charmander evolves into Charmeleon and learns Dragon Claw.

Transcript
Showdown in Pewter City/(Transcript)