|Prior forms||MegaKabuterimon (Blue)|
|Cards||(Ja:) St-697, St-889|
Nature Spirits Digimon]]
AncientBeetlemon is an Ancient Insect Digimon whose name and design are derived from "Ancient" and "Beetle". Possessing the attribute of "Thunder", it is one of the Ten Legendary Warriors that saved the ancient Digital World. A Mega who existed only in the distant past, its appearance is fused from many insects such as the Rhinoceros beetle and Stag beetle. Its shell has a hardness rivaling that of Chrome Digizoid, so the falx on both of its arms can cut through anything, and it can easily lift up objects hundreds of times its own weight. Its abilities were later passed on to the "Insect Digimon".
Digimon Battle Spirit 2
D-Tector 2.0 and 3.0
Digimon Story: Super Xros Wars Red and Blue
AncientBeatmon is a Mega-level Digimon. It can be digifused during battle from MegaKabuterimon (Red), SkullScorpionmon, Okuwamon, and Flymon, and will attack with "Tera Blaster". It can also be formed from a DigiMelody.
- Calamity Thunder: Attacks with a calamitous thunder which brings about super-disasters.
- Tera Blaster: Attacks with a super-electrical discharge with a thousand times the power of "Mega Electro Shocker".