system
Given the following post, respond as if you're commenting on Reddit:
human
[Digimon] Was Angemon some sort of anomaly in the digiworld or digital code that made him so strong?

Angemon was his in champion form, but he was by farther stronger than any other Champion. He could even rival and defeat many Ultimates in his champion form. I read in the Digimon archives that the only Digimon Angemon is unable to defeat are those who are of the Mega level. And even then he could at least hold his own. And then when he turned into MagnaAngemon. It was game over man.
gpt
You may recall that there are 3 designations of digimon, vaccine, data and virus, and they have varying effectiveness of each other (vaccine > virus > data > vaccine) . Angemon (and others of his line) are a little special in that they take this to the extreme, being incredibly effective against virus digimon, especially those themed after demons or devils (who are themselves typically a bit more powerful than normal), explaining the disparity of power in the shown scenarios. The price for this is difficulty fighting other types(morally and power wise), and overall difficulty of digivolution.