Description: In this form, Nemex’s power rivals even that of the Cosmic Architect. But where Cosmogogue is a force of pure creation, Nemex is a destroyer of worlds.
Form Change Mechanics: Nemex will normally be in its regular form, but when it holds a Ruin Gem, an item only available through special events, it will transform into the much more powerful Calamity Form. In this form, its stats are increased. When it changes form, its Cycle of Destruction Ability will change to Destroyer of Worlds and its signature move, Sinister Influence, will become Apocalypse Beam.
Signature Move:
Apocalypse Beam
Pure destruction is shaped into a beam. The target faints instantly if this attack hits.
In-Depth Effect: Unlike other one-hit knockout moves, Apocalypse Beam has a flat 50% chance to land a hit. It will not increase chance the higher level the user is than the target, and it can work on targets of a higher level.
Type: Dark/Ghost
Category: Special
Power: —
Accuracy: 50
PP: 5
Signature Ability:
Destroyer of Worlds
Knocks out any Pokémon that is out in three turns when first sent out.
In-Depth Effect: Like Perish Song, any Pokémon that is in battle the first time a Pokémon with this ability is sent into battle, will instantly faint in three turns.
Trivia: Nemex’s Calamity Form shares its name with The Calamity, the monstrous entity faced during Luna, Terra, and Sol’s post-game Team Interplanetary story, as seen in the final chapter of The Cosmic Chronicles. The Calamity is an eldritch monster in the form of a nebula cloud with piercing red eyes, a maw full of teeth, and tentacles all emerging from the cloud. The implication is that The Calamity is a creation of Nemex that mimics its most powerful form.
And here’s a better look at the official art created by AI which was used in the alternate movie poster:
The Cosmic Quest Official Website 