Minidekachimon

Minidekachimon is a Mini Dragon Digimon. It is a Rookie Digimon so small that it's mistaken for an In-Training. Although it isn't good at fighting, it has a big attitude and gets bossy. It is Atamadekachimon's pre-digivolution and rides in its mouth however it is protected inside the mouth of Atamadekachimon, and is completely at ease no matter what hustle and bustle occurs.

Attacks
 * Kocchon: Infuriates the opponent by exhausting them by capitalizing on its small size to dive into their bosom.

Unison Attacks
 * Minideka Flame: Spews flaming breath alongside Atamadekachimon, but it's never known what size the flames will be until it comes out.

Etymologies
Official romanization given by the Digimon Reference Book and used in the franchise.
 * Minidekachimon (ミニデカチモン)
 * (En:).
 * (Ja:) Atamadekkachi (頭でっかち).

Digimon Adventure:
Minidekachimon, riding around in an Atamadekachimon's mouth, acts as the leader of a faction of Digimon fighting over a water source. When and  arrive looking for water, Minidekachimon captures Gomamon to punish him, but  rescues Joe and he and Gomamon lead Minidekachimon's forces to the water fountain where a brawl breaks out between the two factions. Minidekachimon and Atamadekachimon battle with before  smacks Gaossmon into Atamadekachimon's mouth with his tail, ending the battle.

After the battle, Tai and Agumon fish Gaossmon and Minidekachimon out of Atamadekachimon's mouth as the two factions finally reach peace.

Minidekachimon is amongst the many Digimon watching as the DigiDestined battle at the Tree of Knowledge.

DigiWindow
Minidekachimon rides inside Atamadekachimon's mouth.