Pokémon: Advanced Generation · Battle Frontier arc
AG148 · A Chip Off the Old Brock
ミズゴロウとモココ！恋の特効薬！？
Synopsis
What happens.
In the lead up to his Battle Arena challenge, Ash and Grovyle have a practice match against Brock and his Mudkip. Grovyle fires a Bullet Seed, but Mudkip dodges it. Mudkip withstands a direct lash of Leaf Blade and suddenly evolves into Marshtomp.
Synopsis adapted from Bulbapedia's AG148 entry, used under CC-BY-NC-SA 2.5.
Story arc · AG146-AG192
Battle Frontier.
Cast returns to Kanto. Ash faces seven Frontier Brains (Spencer, Tucker, Lucy, Greta, Noland, Brandon, Anabel). Defeats all of them, including legendary Brandon (Regice + Registeel + Regirock). Turns down a Frontier Brain offer.
Read the full Advanced Generation guidePokémon featured · 12
Who appears.
Linked entries open the species page on the Pokédex. Items without a sprite (alternate forms, regional variants, generic group references) fall back to a name pill.
More from this arc
Other episodes in Battle Frontier.
Episode synopsis from Bulbapedia, CC-BY-NC-SA 2.5. Editorial context (arc affiliation, cultural moments, character signatures) hand-verified May 2026. Pokémon, character names, and series titles © Nintendo, Game Freak, Creatures Inc., The Pokémon Company, OLM Inc. This is an unofficial fan reference.