SkullMeramon

Skull Meramon is an Ultimate Level fire Digimon. His Japanese name is Death Meramon.

Digimon Adventure
Skull Meramon was first seen as one of Myotismon's henchmen. He was disguised in his hat and trenchcoat before his encounterment with Sora Takenouchi and Mimi Tachikawa. Birdramon and Togemon tried their best to stop him before Taichi Yagami and Greymon and Koushiro Izumi and Kabuterimon arrived. Greymon Digivolved to Metal Greymon and destroyed him.

Digimon Tamers
A Skull Meramon in hat and trenchcoat (the same outfit from Season One) was among the shadowed Digimon that wanted Rika Nonaka to tame one of them. Another one was among the many Digimon seen through the rip in the sky during Vikararamon's rampage.