Mokumon

Mokumon is a Smoke Digimon whose name and design are derived from "Smoke Cloud" (『もくもく』). It is a Digimon Baby which surrounds its body with a vaporous smoke. Unlike other Digimon, it is unique in that its Digicore is bare, and in order to protect it, it conceals the Digicore within a lot of smoke. Because its Digicore is bare, it is sometimes burned by the smoke, causing the smoke shrouding its body to change and make it a Digimon of the ecosystem. However, this doesn't seem to harm Mokumon or others. Also, because it is still evolving, when it encounters an opponent it immediately runs away. If you happen to see one, it would be best to be quiet.

Digimon Tamers
A group of Mokumon were employed by Shibumi as his helpers when his consciousness was in the Digital World and his body was comatose in the Real World. One of the Mokumon takes Shibumi's form to enter the Real World and sneaks a Blue Card into a boy's card deck. Yamaki chases the Mokumon, thinking it was Shibumi, but the Mokumon disappears into a pile of smoke, revealing that it was really a Digimon. Two other Mokumon appear in Shibumi's library in the Water Space.

Digimon Frontier
A Mokumon appears at the Autumn Leaf Fair.

Digimon Pendulum III: Nightmare Soldiers
Mokumon hatches from the Digi-egg, and digivolves to DemiMeramon after waiting about an hour.

Digimon World Championship
Mokumon appears in Sizzling Desert and South Bridge Valley, and can digivolve to Kapurimon with 20 Machine AP, Koromon with 20 Dragon AP, Sunmon with 20 Holy AP, or DemiMeramon by passing time.

Attacks
 * Smokey Blow (Smoke): Scatters smoke from throughout its body all over, escaping in the instant the opponent has lost sight.