Corsola reefs are a key component of marine ecosystems from Hoenn to Alola, providing not only a precious pink dye which brings wealth to regional economies, but a habitat for countless water pokemon. Unfortunately, they are also threatened the world over, devoured one after another by the menacing, invasive Mareanie.
The Alolan form of Corsola does not exhibit the extreme physical divergences of some Alolan pokemon, but it has evolved alongside a natural predator, and is capable of summoning other water pokemon to protect itself, or at times even successfully fighting back – and reef pokemon in Alola, understanding the necessity of Corsola to their own habitats, rarely let a single Mareanie feast too long. But as ships from around the world began making voyages to Alola, they often carried unwitting passengers, who used their toxic spikes to clamp onto their hulls. Some of these adventurous Mareanie perished, for they were brought to climates too cold for Corsola to grow – but others found an unending buffet of pokemon.
The reefs these Mareanie feasted on often did not survive, and a few colonies disappeared from starvation with no more pokemon to devour. But in others, it was the colorful Mareanie who assumed Corsola's former role, for their own hair and spikes offered young pokemon a maze of their own, and their toxic bodies are as slow to dissipate as Corsola's rocks after death. A Mareanie reef is a strange sight to behold, and in some countries it is considered a biohazard and eradicated on sight. But the toxins so dangerous to Corsola are tolerated by a surprising array of water pokemon, and their presence often scares away the most destructive predator of all: Man.
