Pokémon: The Original Series · Adventures in the Orange Islands arc
EP116 · The Underground Round-Up
マルマインだいばくは!?
Synopsis
What happens.
Ash and Gary prepare to have their battle as his friends and Professor Oak watch from the sidelines. Gary suggests that they have a one-on-one battle to the finish, and Ash agrees, deciding to use Pikachu.
Synopsis adapted from Bulbapedia's EP116 entry, used under CC-BY-NC-SA 2.5.
Story arc · EP083-EP118
Adventures in the Orange Islands.
A filler arc inserted while Game Freak finalized Gen II. Brock stays behind with Prof. Ivy; Pokémon Watcher Tracey Sketchit replaces him. Ash collects four unique island gym badges and defeats Champion Drake.
Read the full Original guidePokémon featured · 20
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 Adventures in the Orange Islands.
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.