Ice-Ghost
The inspirations are varied. The first inspiration is the portal to hell, connected to the caves of Pluto and Kore, known as the "gates of hell," where animals were ritually left to die from the heat. But in this case, not from the heat, because the other inspiration is that in Canto XXXIV, Dante depicts Lucifer as stuck in Lake Cocytus, where eternal ice reigns. So in this case, Cryogonal represents a portal to a hell where eternal ice reigns, where it will gather people's souls.
With the mega evolution, Cryogonal manages to unlock the most glacial cold in the world, the one contained within itself, opening a passage within itself for this frost that will kill the Pokémon to collect their soul, but in doing so it is forced to sacrifice its own soul, losing that minimum of "humanity" it had.
by IlSignorGranchio