Lucemon

While the name Lucemon refers to his Rookie form, Lucemon is unique in that his changes in mode also result in a difference in level.

Lucemon
Lucemon is a twelve-winged angel who has the body of a young blonde boy. He wears large yellow anklets and bracelets, and has the Digital Hazard sign imprinted on his left hand. He was an extremely powerful Holy Digimon, until he became frustrated with his ever-imperiled charges and then mad with power. Despite his fragile appearance, and the fact that he is only a Rookie Level Digimon, he is powerful enough that even Mega Level Digimon fear him. Awoken after a rebellion to bring about peace, it has been taught that he welcomed a long era of darkness. He was an Angel Digimon who believed others could not think for themselves and that the world would be a better place if he made all the decisions. Currently his abilities have been succeeded by the Celestial Digimon.

Lucemon's name comes from the Italian word for light "Luce", a reference to the fallen angel Lucifer.

Digimon Frontier
Attacks
 * Grand Cross: Lucemon creates a facsimile of the solar system in its grand cross alignment and fires this construct at the enemy.
 * Divine Feat: Lucemon creates a spear or sword of light and throws it/slashes his enemy with it.

Lucemon Chaos Mode
Lucemon Chaos Mode is a Demon Lord Digimon whose name and design are derived from the mythological Lucifer, the angelic name of Satan, with "Luce" and "Falldown" as a reference to that name. It is sometimes referred to as "Lucemon Fallen Mode" in American Bandai products. One of the "Seven Great Demon Lords", it represents the Sun and the sin of Pride. It is the strongest of the group, and possesses both the divine and the diabolic. It instigated a rebellion in the far-flung past, and so it was sealed in the Dark Area along with many other Demon Lord Digimon. Its power exceeds that of Ultimates, and is said to rival that of the existence called "God" as well. It has a contradictory existence, in that one side of it loves all things, as God does, while the other is trying to destroy the whole world, as the Devil does. Hence, once it destroys this world, it intends to create a fresh new world.

Digimon World Dawn/Dusk
Lucemon Chaos Mode is obtainable through DNA digivolution of Angemon and Devimon (at level 40+ with 12000 species exp and 50 aptitude) and can further digivolve into Daemon.

Also he can be obtained by digi-egg breeding:

Required Digimon 1: Dark Digimon at Lv75+ Required Digimon 2: Dark Digimon at Lv75+   Hatching Requirements: Attack 290+, Dark EXP 10000+

Attacks Attacks in Digimon World Data Squad
 * Paradise Lost Punch (Paradise Lost): Launches the opponent high into the air with a wild dance of blows, then holds their limbs fixed as it drives them back into the ground.
 * Ultimate Sacrifice (Dead or Alive): Produces a three-dimensional magic square as a glowing orb of Light and Darkness and traps the opponent within this orb, which has a 50/50 chance of either completely annihilating them, or merely inflicting massive damage.
 * Deadly Roll
 * Terrible Dance

Lucemon Shadowlord Mode
Lucemon Shadowlord Mode is the Mega-form of Lucemon. After Lucemon's holy data was scanned, Lucemon absorbed the power of the Dark Area. This dragon Digimon represents the destruction of the Digital World, and carries the crests of the Seven Great Demon Lords on his wings. However, it turns out that this creature is actually merely a puppet&mdash;controlled by Lucemon's true mega form, Lucemon Larva, residing in the miniature, spherical version of the Dark Area, the Gehenna. This form was originally named "Behemon", after the biblical creature Behemoth.

Digimon World 4
Lucemon Shadow Lord Mode appears as the final boss of Venom Jungle.

Digimon World Data Squad
Lucemon Shadowlord Mode was the final boss of the game (known in the game as Demon Lord (超魔王)). Unlike in Frontier, he was not controlled by Lucemon Larva. This is also the only Digimon whose digivolution cannot be unlocked; however, he does digivolve from Lucemon Chaos Mode.

Attacks Attacks in Digimon World Data Squad
 * Tide of Despair (Purgatorial Flame): Exhales an overwhelming wave of purgatoric fires.
 * Annihilation Maelstrom (Divine Atonement): Energy beams are fired in all directions, released from the crests of the Seven Great Demon Lords over its wings. It was originally depicted in the form of absorbing its enemy into the Gehenna zone and disintegrating it.
 * Destructive Field
 * Dimension Slasher He slashes the enemy and turns the Digimon into Digieggs.

Lucemon Larva
Lucemon Larva is the Mega form of Lucemon. He is the true form of Lucemon and resides within the miniature, spherical version of the Dark Area, the Gehenna, that is carried by Lucemon Shadow Lord Mode, who he controls like a puppet. His Digi-core is pure darkness. His name originates from the Italian luce, meaning light, and larva.

Digimon Frontier
Attacks
 * Parasite Stinger: Uses his stinger to launch energy bolts.