The angels pinned him down as Omnimon impaled Diaboromon before he appeared in the Real World as Armageddemon. He and Gatomon paired up and they managed to defeat Kuwagumon.
Later on, they digivolved to Seraphymon and Magnadramon to release the Golden Digi-Eggs.
After the Digimon Emperor was defeated and his block against Digivolution lifted, Patamon had the natural ability to once again assume his Champion form.
When Patamon becomes really weak, such as after a DNA Digivolution, or Mega Digivolution, he is most likely to revert to this form.
Pegasusmon, the "Flying Hope" (or "the hope that gallops across the skies" (Amakakeru Kibou) in Japan), is the form Patamon becomes when he armor digivolves using the Digi-Egg of Hope.
Eventually, Angemon fight off his infection long enough to help everyone entered the Distortion before the reboot begins. Piedmon, the last of the Dark Masters, had been able to turn almost all the Digi Destined children and their Digimon into key chains.