Ryudamon (D-Cyber)

DexDorugamon
As they were falling from the air, Masuken knew they needed a digimon who could fly, so he forced his digiegg to digivolve into DexDorugamon. After falling for a trap, however, DexDorugamon reverted to Ryudamon.

DexDoruGreymon
When Hikaru believes he has killed Teru, he causes his Dorumon to digivolve to DexDoruGreymon but then realises that the Teru before him is an illusion. Masuken switched the real one to anger Hikaru. He then sends out his digimon, A Gaiomon who then fights DexDoruGreymon but is unable to stand up to the power of DexDorugoramon (who Hikaru caused to digivolve).

Owryumon
Masuken's partner is originally a Gaiomon, but is defeated by Hikaru's DexDorugoramon. It reverts into a Digi-Egg, and temporarily becomes a DexDorugamon through Death-X Evolution. Finally, it is revived as a Ryudamon. Ryudamon eventually becomes a Hisyarumon, and after receiving power from the Holy Knights, gains the ability to become Owryumon. Then, finally, Owryumon becomes the blade that allows Alphamon Ouryuken to destroy Dexmon.