Bun

Bun is a vaguely dragon-like Digimon whose species name is unknown; the only appearance has the character naming it Bun. Its species may be a Damemon (ダメモン), a glitch Digimon unable to digivolve, but this information comes only from the words of an antagonist character who may have been mocking it.

C'mon Digimon
Kentarou Kamon finds an abandoned Dock in the trash. Makoto then takes him to his house and hooks the Dock to a 3-D Virtual Monitor, which displays a Digimon Kentarou eventually names Bun. After Makoto's Dock is destroyed by Shinichirou Jousaki in a Death Battle, Kentarou trains Bun to fight Shinichirou's Deathmon. Bun defeats Deathmon after Kentarou firms his resolve upon revealing why he dislikes animals, though Bun loses every following normal battle.

Attacks:
 * Spinning Tail Cyclone: Rapidly spins tail to propel into an enemy.

Hint

 * Bun is possibly the original concept design of Mamemon as it appears in vpet1, the small and strongest Digimon in ultimate level.