Devimon was the first villian of Digimon Adventure. He carefully planned out
everything he did, which made him deadly. He used Black Gears to control Digimon. He planted
the Black Gears into the Digimon's body, which then controled the Digimon according to whatever
he wanted that Digimon to do. His most faithful servant was Ogremon. Devimon tried different
tactics of destroying the Chosen Children, from seperating the Chosen Children from one another,
to facing them off in a battle where he was way larger than normal. He was able to easily fend off
the Chosen Children's Adult Digimon. After reaching for Takeru, with the intention of destroying him,
Angemon, Patamon's Adult form, was born, and Devimon was destroyed. Devimon was so strong that
it took all of Angemon's strength to destroy him. Angemon was deleated, just as Devimon was,
but Angemon came back as an egg. Devimon's Black Gears continued to work even after Devimon
was gone, but only if they were already implanted in a Digimon's body while Devimon was still
alive.