Believing that danger and energy are the keys to evolution, Tai stuffs Agumon with food and then intentionally puts himself in harm's way to trigger a transformation.
Because Tai’s heart is filled with pride and force rather than true courage, Greymon undergoes a Dark Digivolution into SkullGreymon .
While wandering the desert, the DigiDestined are lured into a Roman-style colosseum by Etemon. Tai, having recently acquired his Crest of Courage, becomes obsessed with forcing Greymon to evolve to the "Ultimate" level to defeat Etemon. Digimon Adventure Episode 16
In the Digimon Adventure franchise, Episode 16 of both the original series and the 2020 reboot represent major turning points.
Digimon Adventure - Episode 16 - Dark Evolution! SkullGreymon Believing that danger and energy are the keys
Joe finds his Crest of Reliability hidden under a soccer goal in the colosseum.
This episode is legendary for introducing "Dark Digivolution" and serves as a major lesson in leadership and pressure. Tai, having recently acquired his Crest of Courage,
SkullGreymon is an mindless, rampaging skeletal monster that destroys everything in sight—including Etemon’s tower and even Tai’s friends. Eventually, he runs out of energy and reverts to Koromon, leaving Tai devastated and regretful for his recklessness.