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Credit for Summary: Digimon Adventure 2020 Wikipedia. Thank you!
The children finally reach the ocean and take a moment to relax. Birdramon flies Taichi, Sora, and Agumon to scout the sea but they are knocked out of the sky by a Gesomon lurking beneath the waves. The group is rescued and brought back to shore by Gomamon, an aquatic Digimon who reveals that he is the partner of Joe Kido, another chosen one.
The group attempts to convince Joe to join them on their quest but he refuses, being more worried about high school entrance exams than saving the world. Joe tells Gomamon to join Taichi's group while he stays behind to study and wait for help.
Taichi and the others form a plan to lure Gesomon to shore using Gomamon as bait. The plan succeeds but Gomamon is injured, and as Gesomon holds its own against Greymon and Togemon, Joe realizes that Gomamon has always been there for him during his time in the Digital World, triggering Gomamon's evolution into Ikkakumon.
Together, the three Digimon defeat Gesomon and the children ride Ikkakumon to their next destination.