|Prior forms||Wormmon + Digi-Egg of Reliability|
|Voice actors||(Ja:) Tomomichi Nishimura (Xros Wars)|
(En:) R. Martin Klein (Fusion)
Archelomon is a Reptile Digimon whose name and design are derived from the Archelon. It armor-digivolved due to the "Digi-Egg of Reliability". It has the appearance of a large sea turtle, and both of its flippers have become sharp like knives. It doesn't move around particularly quickly even underwater, and has a carefree personality, but because it has sharp fore-flippers and a sturdy shell, it's rarely assaulted by the enemy.
Digimon Tamers: Battle of Adventurers
An Archelomon is among the Digimon in VP Labs when Takato and his cousin Kai Urazoe venture there to rescue the kidnapped Minami Uehara. It lunged at them as they emerged from the lab's tide pool, but Growlmon easily destroyed it in mid-air. Shortly thereafter, another Archelomon is in the void between Earth and the Digital World. However, it is quickly destroyed by Omnimon.
- Ocean Streamer (Ocean Strom): Conjures up a ferocious storm by crying out to the clouds.
- Fin Cutters (Fin Cutter): Attacks with his blade-like flippers.