Kotemon [Muysamon] and Ryudramon drop special eggs.
Asuramons drop Golden Eggs, which you can scan for one of 6 different mercenary eggs. Which means even if Asuramons drop an egg, it's a ONE IN SIX CHANCE it'll be a Muysamon egg.
Ryudramon are the same, except they are in Lab Access, and drop 2 kinds of eggs. However, as both the Black and White eggs have a 1/6th chance of Ryudramon, the overall chance is still 1/6th.
Kudamon is also only avaliable through random eggs, except only during events, and through digi-cores; which makes Kudamon THE hardest digimon to get.
Kudamon is harder than Ryudramon, and Ryudramon is harder than Musyamon. Nothing else even comes close to the tedium of getting those digimon.
KDMO: Squishy1 [Server 3/4] - Mimi
Tamer Lv 60
Highest Digimon: Aeroja, Kiwimon, Lv 84, +12 AT 8 CT
Largest Digimon: Aeroja, Kiwimon, 127%
Make Money, amass inventory/bank slots.
Prepare for the mystery of Marsmon