Tsukaimon

Tsukaimon is a Rookie Level Mammal Digimon, whose name comes from the Japanese "tsukai", which means messenger. Though he looks like a dark blue version of Patamon, this evil Digimon is a total opposite. Tsukaimon prefers to leave the fighting to someone else and just as soon as a fight breaks out, he will be taking bets on the outcome. He is used as a messanger of higher ranking Virus Digimon. He is usually a servant to a evil or Virus type digimon like Daemon.

Digimon World
Appears as a Patamon look-alike wild Digimon.

Digimon World 2
Tsukaimon can digivolve to Bakemon or Soulmon depending on its DP.

Digimon World Data Squad
http://digimon.wikia.com/wiki/User:Maitkarro/DW_Data_Squad#Tsukaimon

Digimon World DS
Tsukaimon can digivolve from Pagumon.

Digimon Dawn/Dusk
Tsukaimon digivolves from Kuramon then into Devidramon or Bakemon. Four also can be fought in Thriller Ruins during a Union Quest to find Chief Glare in Dawn or Chief Julia in Dusk.

Attacks 
 * Bad Message
 * Purple Fog
 * Friendly Fire
 * Fluffy Attack (ふわふわアタック)

Variations / Subspecies
 * Patamon