ONE PIECE Episode 172: The Ordeal of the Swamp! Chopper vs. Sky Punk Gedatsu!
Episode 172 of 1180 of ONE PIECE, aired November 2, 2003, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Chopper is attacked by Gedatsu, who turns out to be a complete moron, and eventually defeats him, sending him plummeting to the Blue Sea. Conis and Pagaya help Aisa, and head to Upper Yard.