Archelomon

Archelomon is the Armor Digivolved form of Wormmon through the Digi-Egg of Reliability. He is named after the Archelon, a giant prehistoric turtle. He calmly and gracefully swims through the Net Ocean. He defends himself with his hard shell and the knives on his hands. He is good at both attack and defense.

Digimon Tamers: Battle of Adventurers
An Archelomon was among the Digimon in VP Labs when Takato and his cousin Kai Urazoe ventured 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 was seen in the void between Earth and the Digital World. However, it was quickly destroyed by Omnimon.

Digimon Xros Wars
An Archelomon appears in episode 4 on the Island Zone. He seems to have a problem remembering the names of some digimon.

 Attacks
 * Ocean Streamer (Ocean Strom [Ocean Stream]): Conjures up a ferocious storm by crying out to the clouds.
 * Fin Cutters (Fin Cutter): Attacks with his blade-like flippers.