Joe finds his Crest of Reliability hidden under a soccer goal in the colosseum.
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. Digimon Adventure Episode 16
This episode is legendary for introducing "Dark Digivolution" and serves as a major lesson in leadership and pressure. Joe finds his Crest of Reliability hidden under
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. Digimon Adventure Episode 16
Because Tai’s heart is filled with pride and force rather than true courage, Greymon undergoes a Dark Digivolution into SkullGreymon .