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Credit for summary Digimon Adventure 2020 Wikipedia. I made a few changes (^_~)!
Taichi and Greymon are on Cloud Continent protecting a Cutemon from a marauding band of Giromon. Greymon evolves into MetalGreymon when a hooded figure approaches them. Cutemon and the Giromon instantly recognize the figure as Rebellimon, a reckless Cyborg Digimon, who one by one defeats all but one the Giromon before attacking MetalGreymon. As they fight, MetalGreymon is reminded of Ogremon and their previous fight. Rebellimon leaves, but not before warning Cutemon to stay away from him.
Later, Cutemon tells Taichi and Agumon that this portion of the continent is a wasteland where strong outlaw Digimon would come to start turf wars and bully the weaker ones. Cutemon first met Rebellimon after he saved her from the Giromon, only for Rebellimon to call her a nuisance for being weak. Cutemon believes that Rebellimon has lost all sense of reason to fight, when Rebellimon took on a Boltmon and ended up badly injured.
Not long after, Giromon returns with three Boarmon. With the combined strength of Greymon and Rebellimon, they take out the Giromon and Boarmon. That night, Cutemon heals Agumon's wounds. Taichi asks Rebellimon what his reason is for fighting. Rebellimon replies that he has no reason to fight, but Taichi believes that he has someone whom he wants to protect. Agumon adds that he becomes super strong whenever he protects Taichi.
Suddenly, the same Boltmon that defeated Rebellimon shows up and attacks the group. Rebellimon charges in by himself, only to be brought down again with a single punch by Boltmon.
Rebellimon looks back at the last time he was brought down to defeat and how Cutemon healed his wounds. This inspired Rebellimon to get up just in time to save Cutemon from getting crushed under Boltmon's boot. Rebellimon questions why he saved Cutemon. Then he remembered what Taichi and Agumon said about protecting someone whom one cares about.
Cutemon heals Rebellimon's left arm allowing him to fire a Vanquish Missile at Boltmon. Boltmon blocks the missile with his right hand, but due to the blast, he is unable to grab his tomahawk. It gets stuck in his chest. He knocks it off of himself with another punch. The two Digimon then throw one last punch at each other, with Rebellimon's Maximum Demolisher finally destroying Boltmon.
Victorious, Rebellimon lets out a roar.
The following morning, Taichi asks Rebellimon what he will do next. Rebellimon replies that he will find another strong Digimon to fight and asks Cutemon to come along with him. Taichi and Agumon tell Cutemon that they are following where ever the Digivice takes them, and when they ask where Cutemon and Rebellimon are heading, Rebellimon simply replies: "Straight ahead..."