Bakumon It is believed to have originated from a medical computer designed to study brain waves and seems to feed on data from human REM sleep.
Recent research has revealed that it has the power to erase particularly bad dreams
Debut: Pendulum 3.0 Nightmare Soldiers (V-Pet)
Fun Fact: Bakumon shares the name of its attack "Nightmare Syndrome" with Digitamamon. Although the two techniques appear to be different based on their descriptions, the pair are shown to be able to perform a "Double Nightmare Syndrome" attack together; as seen in Episode 37 of Digimon Adventure 02.