Disintegrate

Disintegrate is Shadow Heatran's signature technique, shown onscreen only in the glitch recreation of the Cipher Resources Building meltdown. It is a charged attack that results in a huge column of what can only be described as hellfire, which completely destroys entire rooms and anything within it. The charging turn is accompanied by a piercing whistle of steam, not unlike that of a tea kettle.

Dune wondered if it was a variation of Shadow Fire, although the question is never answered and it is uncertain whether the attack is even a Shadow move in the first place. The attack is not even named in-universe, instead being unofficially named in the meta. It was seen used simultaneously with Heat Shield, and may in fact rely on that sheer level of heat.

It was implied to be what Heatran used to destroy the Resources building in the original event, but due to the majority of it happening offscreen, there is no proof.