Comparate to Mythical Pokémon, whose existence is confirmed by numerous writings and eyewitness accounts, Misty Pokémon are described only in very rare accounts, with very few truly reliable ones.
Kalos Heatran is one of those Pokémon that borders on the imaginary. Its existence is described in an old expedition report to the Frost Cavern, dating back two centuries.
This report describes how the team was attacked by this variant of the Caldera Pokémon, capable of freezing rock walls to cling to them, before firing powerful ice beams. But the most fascinating thing is the Pokémon's power, which allows it to dig through millennia-old permafrost as hard as diamonds. In any case, after being defeated, the creature retreated, descending into an unfathomably deep ice crevasse. The exploration team named the chasm the Arctic Abyss, but when a new expedition was launched to explore the chasm, they were unable to find it.
Even though the expedition actually took place, the presence of a Heatran in the caverns was never again documented, casting doubt on the reliability of the testimony, especially since the fiasco of the second expedition caused the regional council to lose a considerable amount of money…
by Cursachu