Raremon

Raremon is an minor villain in the Digimon series. He resembles a sludge-like monster that has a horrible stench and bad breath

Digimon Adventure
Raremon first appeared as a minion of Myotismon. He went to find the 8th Digidestined and the tag and crest. He attacked Izzy, but Kabuterimon saves him and destroys Raremon.

Digimon Frontier
After Koji fought some Pagumon who were torturing J.P. and Tommy, a Pagumon Digivolved to Raremon and fought Koji. When Koji gained his new Spirit Of Light, he Hybrid Digivolved to Lobomon and killed Raremon once and for all.