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.

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

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.