Out of all of Ash's companions, Brock has remained by his side for the longest, having been involved in a whopping twelve seasons (so far). This Pewter City hot-shot has made some significant transformations during his adventures, from Gym Leader to aspiring Pokemon Breeder to a Doctor-in-Training; which is more character development than most other Pokemon Trainers experience. Brock accompanied Ash from The Johto Journeys until Diamond and Pearl: Sinnoh League Victors, before this wanna-be ladies' man retired from the main cast roughly 14 years after his debut. While he has popped up now and then, the time has finally arrived for Brock to steal the spotlight (and lose his shirt) for the Pokemon: The Arceus Chronicles mini-feature.