Sorry for taking so long to get to this.
| Gold | It continuously sheds and grows. The tip of its head is prized as a treasure for its beauty. |
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| Silver | In a south sea nation, the people live in communities that are built on groups of these Pokémon. |
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| Crystal | The points on its head absorb nutrients from clean water. They cannot survive in polluted water. |
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| Ruby | 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. |
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| Sapphire | Clusters of Corsola congregate in warm seas where they serve as ideal hiding places for smaller Pokémon. When the water temperature falls, this Pokémon migrates to the southern seas. |
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| Emerald | Corsola live in warm southern seas. If the sea becomes polluted, the beautiful coral stalks become discolored and crumble away in tatters. |
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| Sun | Coral branches grow from its head. They break off quite easily, but they grow back in about three days. |
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| Moon | Pursued by Mareanie for the branches on its head, this Pokémon will sometimes snap its own branches off as a diversion while it escapes. |
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| Ultra Sun | The pink of Corsola that live in Alola is deep and vibrant, thanks to seas filled with nutrition. |
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| Ultra Moon | In Alola, where their natural enemies Mareanie are plentiful, many Corsola have stubby branches on their heads. |
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| Sword | It will regrow any branches that break off its head. People keep particularly beautiful Corsola branches as charms to promote safe childbirth. |
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| Shield | These Pokémon live in warm seas. In prehistoric times, many lived in the oceans around the Galar region as well. |
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Safety: 4.5/5 People (Presumably those of Pacifidlog or similar.) have lived in structures built atop colonies of Corsola, so it's probably quite docile & probably doesn't need to move much. The worst I can say about it is that it might attract Mareanie to prey on it, small Pokemon seeking shelter in it if they can get into your Corsola's water enclosure, or weird people who want its branches for their beauty or other reasons.
Behaviour: 4.5/5 If broken, it branches grow back in an amount of time between 1 night & 3 days. (Why is it inconsistent? Is it because Ruby doesn't have Mareanie, unlike Sun?) This suggests Corsola branches grow very fast. Corsola also snap their own branches off (How?) as a diversion to escape Mareanie. As long as you didn't build your house atop one & there aren't anything that'd prey on it, these probably don't concern you. It congregates in warm water, so I guess the biggest worry is don't let the water be warm where it's dangerous for it? (How would that even happen.)
Housing: 4/5 Warm water is presumably preferred, & probably salt water/sea water to match its environment. It might appreciate small friends to dwell in its branches to emulate its environment. At 60 cm & 5 kilograms, it isn't very big, & it's very light, though it's probably larger than most IRL aquatic pets. Mareanie predation left many wild Corsola with stubby branches, so maybe also mind that. But its a living coral creature, of course you're going to be paying attention to the branches, right?
Ease of Care: 4/5 Healthy Corsola, especially in Alola, have deep & vibrant pink colours thanks to nutrition. Those in polluted waters will become discoloured & crumble away in tatters. Obviously, you shouldn't be keeping your aquatic pet in anything like polluted water. If it didn't require a big thing of seawater, Corsola would be higher.
Typing: 3/5 If I understand right, for dual types, you take the average of the two types. Water is 4, Rock is 2, so 3.
Total: 20/25
Perhaps I was a bit too strict on it? But IDK how many people can reasonably provide a suitably sized enclosure of warm, unpolluted sea water for a 60 cm 5 kg creature, even if it probably is docile & mostly unmoving.
While I'm at it, Galarian Corsola:
| Galarian Corsola | |
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| Sword | Watch your step when wandering areas oceans once covered. What looks like a stone could be this Pokémon, and it will curse you if you kick it. |
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| Shield | Sudden climate change wiped out this ancient kind of Corsola. This Pokémon absorbs others' life-force through its branches. |
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Those are all of the Pokedex entries Galarian Corsola has.
Unlike Johtonian Corsola, Galarian Corsola can evolve, into Cursola:
| Sword | Its shell is overflowing with its heightened otherworldly energy. The ectoplasm serves as protection for this Pokémon's core spirit. |
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| Shield | Be cautious of the ectoplasmic body surrounding its soul. You'll become stiff as stone if you touch it. |
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Safety: 2/5 Presumably stays in water, or areas where oceans once were, can be mistaken for a stone, will curse you if "kicked", which probably means your foot accidentally making contact with it. & while we're clarifying, since it's a Ghost-type, it cursing you probably means worse than it using rude language. Further, it absorbs others' life force through its branches, so you probably can't even touch it without risking a bit of your life span. The only reason I'd consider this more than a 1 is it's not certain to be lethal, & it's probably stationary, so it might be able to be relocated through careful tool use if necessary. If it evolves, it brings a risk of petrification/paralysis of indefinite duration on contact, so mind that.
Behaviour: 3/5 Watch where you walk & don't touch it & it won't hurt you. A lot of creatures follow these rules, you should be able to do so, too.
Housing: 2.5/5 Might be more accustomed to extinct environments, since it's a Ghost-type & an "ancient kind of Corsola", extinct as a result of "sudden climate change" in Galar. I'm unsure if this means coolor or warmer water, but just be extra sure to keep its water extra unpolluted if you don't want it to decide it needs some supplements of your life force. Its evolution is almost twice that size, at 1 meter/100 cm. But still lighter than Johtonian Corsola, as Cursola only weighs 0.4 kg. It got lighter somehow?
Ease of Care: 2/5 Galarian Corsola is the same size as Corsola, 60 cm, but only one tenth of the weight, at 0.5 kg, probably because of its ghostly nature. But because it's dangerous to touch, it's probably dangerous to do maintenance like cleaning it or its tank. The extra 4.5 kg Johtonian Corsola comes with it might be worth it for the easier handling, but maybe with some good tools. Would they even work on a Ghost-type? Maybe it won't drain your life force if it trusts you? Especially if it's a tamed/domestic "pet" Pokemon? Even more caution is advised with its bigger, lighter & seemingly more dangerous evolved form.
Typing: 0/5 Pure Ghost-typing is rated as a 0 out of 5 in this system's scale.
Total: 9.5/25
Maybe I was too lenient? Being lighter does it SOME favors, as does being stationary & seemingly not aggressive. A lot of its rating is affected by a lack of information. It doesn't seem clear if the life-draining or turning stiff as stone are permanent or what.
Give it a nice environment & keep it away from predators (This should be easy.), & it'll probably be manageable. Maybe even safe to touch if it can control its abilities if it trusts you.
