Corsola is a small, pink, roundish AnthozoanPokémon with branch-like growths on its back, which are similar to coral. There is a smaller, blunt horn on its forehead, and it has black, oval eyes. It has a light-blue underside, which speckles towards the sides. Its four legs and two arms are blunt and stubby.
Smaller Pokémon like Horsea and Luvdisc are sometimes sheltered by Corsola's branches, and even offer it protection from foes. Corsola's horn is a prized material, commonly used for jewelry and carving, as seen in the anime. Some people keep Corsola branches as charms to promote safe childbirth. Corsola's branches glitter very beautifully in seven colors when they catch sunlight. If any branch breaks off, this Pokémon grows it back in just one night.
Found in the warm shallow waters of southern seas, Corsola requires clean water to live. If its habitat is dirty, the growths on its back become discolored and degenerate. However, when it is healthy, its growths regularly shed and grow back; it is able to regrow them over the course of a single night. It forms large social groups. Occasionally, these groups get so large that people may live atop them, as is the case in Pacifidlog Town.
In the Alolaregion, Mareanie and Toxapex are natural predators of Corsola, preying on its branches. If pursued by them, Corsola will sometimes snap its own branches off as a diversion. Conversely, Mareanie and Toxapex do not prey on Corsola in the Galar region, having not developed a taste for its branches.
Galarian Corsola were wiped out by sudden changes in the climate and ocean temperature, turning them into Ghost-types. Its body is a bleached white with half-closed pink eyes and a perpetual frown, and its arms and branches have a distinctly semitransparent appearance to them. These branches are incorporeal and can disappear at will. They cannot cause injuries or pain, but they can be used to take root inside and drain the life force of others, and will immobilize the victim until Galarian Corsola lets them go.
Galarian Corsola are commonly found in the remains of prehistoric seas, and while they can be mistaken for ordinary rocks, they will curse anybody who kicks them by accident. Galarian Corsola consumes spirit energy from the life force its absorbs. This diet eventually causes Corsola's shell to break, its body to become incorporeal and its spirit energy to pour out, thus completing its evolution into Cursola.
Misty has a Corsola that she caught in the Whirl Islands in A Corsola Caper!. It wandered into a group of Corsola raised by Andrea and her family living in Yellow Rock Isle. It caused trouble for them as it was very energetic and tackled all the Corsola, scaring them away. Things were solved when Misty battled and caught the Coral Pokémon in a Lure Ball.
Corsola made its main series debut in Around the Whirlpool, under the ownership of Professor Elm. It has a fondness for pools. The sight of Corsola inspired Misty to catch her own.
Multiple Corsola appeared in A Corsola Caper! alongside Misty's; they were all under the ownership of Andrea and her family. They were scared off by Misty's Corsola and the group spent the episode trying to recover all of them. They each had a unique nickname: Annie, Danny, Connie, Bonnie, Johnny, Donnie, Ronnie, and Lonnie.
Three Corsola appeared in Yo, Ho, Ho! Go, Popplio!, with two being wild and the third appearing in a fantasy. One of the wild Corsola was walking along an island where Ash, his classmates, and Professor Kukui were taking a break from fishing.
A herd of Corsola appeared in Off Course with Corsola, where they weighed down Lt. Surge's miniature submarine. However, Crystal, who had been accidentally kidnapped into the submarine, used her capturing skills to free the submarine from the Corsola.
Corsola appears to be based on coral, possibly precious coral, which is used as a precious stone.
Galarian Corsola appears to be based on bleached coral, a phenomenon in which coral expels the algae that give it color, primarily because of rising water temperatures as a result of climate change. Its Ghost type refers to the high mortality rate of bleached coral.