Four Great Dragons

The Four Great Dragons (『四大竜』) are four super-powerful Mega-level dragons working behind the scenes of the Digital World. The group consists of Azulongmon, Megidramon, Goldramon, and Magnadramon. However, not all of them are Holy Dragons. While considered an organization in the trading card game, no member has appeared in any series acting in their capacity as a member of the Four Great Dragons.

Azulongmon
Azulongmon is an Exalted Dragon Digimon, one of the four Digimon Sovereigns and the Guardian of the Digital World's Eastern Hemisphere. He is also one of the Four Great Dragons (alongside of Goldramon, Magnadramon and Megidramon). His Japanese name is Qinglongmon, derived from Qinglong, the Chinese astronomical name for the eastern quadrant of the sky. The Japanese word Seiryuu is also derived from this. He commands the Devas Mihiramon, Majiramon and Antylamon.

Azulongmon appears only in times of critical importance and favors the human/Digimon bond though he rarely helps them and others unless needed to.

Azulongmon is the second highest Sovereign, also the second oldest he is almost as powerful as the creator Fanglongmon.

Digimon Tamers: Brave Tamer
The Azulongmon card teaches a Digimon the attack Sourai.

Digimon World DS
Azulongmon is the Observer of Beginner Tamers. When a virus breaks out, Azulongmon appears as a boss at the Sky Palace.

 Attacks
 * Aurora Force (蒼雷): Curls his body into a circle, releasing a powerful blast of electrical energy.
 * Wind Electricity (風絲華電)
 * Raijin no Mai (雷神之舞)
 * Lightning Whip: Attacks with the many electric chains around his body.

Megidramon
Megidramon is an Evil Dragon Digimon, one of the Four Great Dragons. His name comes from the word "Megiddo", the place where Christians believe the final battle between good and evil will take place. He is a rare (in fact, unique in every single DW) species whose reason for existing is unknown, but is said to be one of the very incarnations of the Digital Hazard, a power of malice that is sealed away by an unknown "force". However, when that power is awakened, he creates a system meltdown which could destroy the Digital World.

Digimon World Dawn/Dusk
Megidramon digivolves from WarGrowlmon when it has 9000 dark experience points and if the player has Guilmon's data.

Attacks Variations / Subspecies 
 * Megiddo Flame:: Exhales the fires of hell upon its enemy.
 * Hell Howling: Megidramon howls while facing the enemy; the shock of the sound itself is critical to most weaker Digimon.
 * Megidramon X

Goldramon
Goldramon is an Exalted Dragon Digimon and is the greatest of the Four Great Dragons. A Holy Ring is attached to his arm. Amon of Destruction is sealed in his right hand, while Umon of Creation is sealed in the left.

Digimon Adventure V-Tamer 01
In the Crossover Special "Frontier Generation", Goldramon was one of the forms taken by Metamormon to fight Zeromaru.

Digital Monsters: D-Project
Goldramon digivolves from AeroVeedramon.

Digimon World Dawn/Dusk
Goldramon digivolves from AeroVeedramon, but you must first befriend Airdramon before AeroVeedramon can digivolve.

Attacks Variations / Subspecies
 * Gold Flame (God Flame): Releases a powerful holy flame.
 * Summon (召喚): Summons Amon and Umon to attack his opponents.
 * Amon of Crimson Flare is a dragon sealed within his left arm. Amon administers destruction.
 * Umon of Blue Thunder is a dragon sealed within his right arm. Umon administers creation.
 * Goldramon X

Magnadramon
Magnadramon (Holydramon in Japan) is an Exalted Dragon Digimon and one of the Four Great Dragons. She is also one of Gatomon's Mega forms.

Digimon Tamers: Brave Tamer
Magnadramon is obtainable by having Ryo Akiyama save Hikari "Kari" Kamiya and leveling up Gatomon.

Digimon World 2
Digivolves from Angewomon regardless of the Number of DP the digimon has at the time.

Digimon World Dawn/Dusk
Magnadramon is DNA Digivolves from a combination between Angewomon, Lillymon or Lilamon.

Attacks Variations / Subspecies
 * Fire Tornado (Holy Flame): A spiraling flame is shot from the mouth.
 * Dragon Fire (Apocalypse): Calls down energy bolts from the heavens to strike her opponents.
 * Hermit Fog: Sprays forth a mist from her mouth that corrodes anything that it touches.
 * Magnadramon X