It's Mr. Rime Time!
Note: NOT THE SAME as Ice/Psychic.
Mr. Rime [Optimized]
Abilities:
Mimicry, Screen Cleaner, Filter
Stats: 80 / 85 / 75 / 110 / 100 / 70 -> 80 / 100 / 95 / 120 / 115 / 45 (555 BST)
Added Moves: Swords Dance, Teeter Dance, Acid Spray, Infestation, Frost Breath, Grassy Terrain, Electric Terrain, Nature Power, Revelation Dance, Dragon Dance.
Summary of Changes: Corrected Game Freak's mistakes.
Reason: Mr. Mime has access to two kinds of terrain summons by default: Psychic and Fairy. The fact that Mimicry was given to something that essentially uses Camouflage on switch-in (why wasn't it called "Blend In" then?) is just a poor choice for the Pokémon to which it was applied. However, to be able to change type (because Psychic/Ice is disgusting) upon summoning a terrain (with access to all four now) is not just an okay thing for Mr. Rime; it was MADE FOR them. (Mime Jr. evolves into Mr. Mime by using Mimic, for miming out loud!)
Perrserker [Optimized]
Abilities: Berserk, Fur Coat,
Metalworker
Stats: 70 / 110 / 100 / 50 / 60 / 50 -> 80 / 120 / 80 / 110 / 80 / 85 (555)
Added Moves: Knock Off, Sucker Punch, Anchor Shot, Flash Cannon, Gyro Ball, Outrage
Summary of Changes: Make it Darker, though I should probably make it more of a fighter.
Reason: It's a berserker. Why shouldn't it have
Berserk as its Ability? Berserkers are like vikings, thus why Meowth-Galar is all… shaggy. Since they're Steel type already, it totally makes sense to have Anchor Shot. Steely Spirit is just… egh… needs to be Metalworker. I mean, I like Battle Armor, it makes sense… but this thing already learns Metal Sound, Nasty Plot, Dark Pulse, and Shadow Ball, (these moves and more are also why I gave it Dark type; this, and I'm bored with Bisharp being the only Dark/Steel out there) so why not have its Ability expand to a more Special offensive? Flash Cannon, because what good is a Special-capable Steel-type without it? Also Outrage and Gyro Ball, because, well…
"Have ya seen berserkers in action?" Tough Claws is meh-ok… I feel like Game Freak got Persian-Alola and Perrserker mixed up, because… I mean, LOOK AT IT. It's got a THICK COAT OF FUR on its NECK. Fur Coat gives a much better defense against Fighting-type attacks (this thing takes 4x damage from them) since those are primarily Physical (except Final Gambit, Focus Blast, and Aura Sphere, the first two of which are, like, NEVER used, but the last of which has been over-distributed this gen for some reason), so it won't faint to Superpower, but might to Storm Throw.
Cursola [Optimized]
Abilities: Innards Out, Perish Body,
Skill Link
Stats: 60 / 95 / 50 / 145 / 130 / 30 -> 100 / 80 / 60 / 150 / 115 / 30 (555)
Added Moves: Wonder Room, Psyshock, Infestation, Water Shuriken, Aqua Ring, Branch Poke (because coral have branches, duh), Metal Burst, Acid Spray, Muddy Water, Megahorn (because they're like horns), Weather Ball, Echoed Voice, Stored Power, Spiky Shield
Summary Of Changes: Made it more like a Special Stonjourner, but not from the pointlessness perspective.
Reason: Just look at it. Its INNARDS. ARE. OUT. And with a Rest-In-Pieces defense stat, it's a no-brainer for the effects of Innards Out considering the consequences of Physical contact moves. Higher HP means more lost from the effects of Innards Out, making everything that faces it think twice before striking physically. As for Skill Link, I've just always felt like Corsola deserved it. It was kinda unfair that Cloyster got all the perks with such a low SpD and particularly a Type that is vulnerable to primarily Special attacks. Optimized, Cursola has no trouble taking even super-effective Special hits and returning with STAB on the very Type that makes it Specially vulnerable.
Inner Focus would defeat its vulnerability to Dark Pulse, which I think would be the primary way to deal with this creepy coral.