Burpmon

A Digimon will evolve into Burpmon if its weight reaches 80G. It will be constantly hungry, but almost no amount of food will sate it. It will also refuse training of any kind. It will infect any other digimon it comes in contact with, turning them into a Burpmon also. It will change back to its original form once its weight drops below 80G. All the while, beeping non-stop for food you refuse to give it.