As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Gorebyss:
Tales from the Pokédex: Gorebyss
It sucks bodily fluids out of its prey, allowing the leftover meat to sink to the seafloor.
@SuperDuperDani brings us the story behind Gorebyss in Tales from the Pokédex, a special Halloween series about spooky Pokédex entries. Which Pokémon scares you the most?
Official Pokédex entry: The color of its body changes with the water temperature. The coloration of Gorebyss in Alola is almost blindingly vivid. It sucks bodily fluids out of its prey. The leftover meat sinks to the seafloor, where it becomes food for other Pokémon.
Source: The Pokémon Company