S rank:
Calyrex-Shadow

- The best restricted available purely because of the damage, Astral Barrage and Expanding Force are some of the strongest moves in the game, bolstered by Caly-S

's ridiculous Special Attack and Speed stats. Terastallization gives it a way to minimize damage taken from stuff like Snarl, Knock Off, and Sucker Punch, BUT ALSO COVERAGE??? This Pokemon was barely kept in check due to the fact it couldn't touch Dark-types, but now it's able to just Tera Fighting / Fairy and Tera Blast away its supposed checks. Did I mention its ability, As One? Which prevents Incineroar from eating its Sitrus Berry and gives it a Special Attack boost every kill, meaning you can't effectively sac against it. To top it off, Yveltal

, Caly-S

's best answer, is currently not in the game. Life Orb / Focus Sash 3 Attacks, Snarl, Choice Specs Tera Ghost, even Nasty Plot, are all legitimate sets that wreck teams. It is not without counters however, Snarl Incineroar

can still prove to be annoying and so can Rillaboom

, overriding terrain and making it harder for Calyrex-Shadow

to handle Ghost resists. Terapagos

and Lunala

are good restricted answers with Calm Mind and Wide Guard respectively.
Zacian-Crowned

- The one restricted that can compete with Calyrex-Shadow

. Zacian

bears equally devastating Attack and Speed stats, great bulk (My current spread can live Groudon

's Precipice Blades and two Calyrex-Shadow

Astral Barrages as examples.), and arguably the best typing in the game. Sure, the ability nerf has hurt it a lot, making Incineroar

a lot more consistent as an answer, however, Intrepid Sword is still a fantastic ability, +1 Atk allows for so many stupid calcs that sometimes it feels like your opponent just loses without Incineroar

. Zacian

can still be a great endgame Pokemon with its phenomenal stats and typing, escaping the Intimidate cycling when in the back. Zacian

can also be a mid-game sweeper with Swords Dance, outdoing the Intimidate drops and doing monstrous damage, especially with Chien-Pao

. You can also forego Swords Dance for Fighting or Tera Blast coverage and partner up with Gouging Fire (which ftr is insane rn, fast snarl and howl wrecks a lot of the metagame.), simply saying 'no' to Intimidate. Should note that Fire-types are still an issue for these teams, especially Tera Fire Groudon

or Koraidon

which care less about Ogerpon-W

.
A+ Rank:
Nothing, I firmly believe the above two are so much better than everything else that this shouldn't belong to another restricted. In duel restricted formats this would definitely be filled, but here, when you choose another restricted Pokemon, you sacrifice the opportunity to use Calyrex-Shadow

or Zacian-Crowned

. The below tier is definitely great Pokemon but they're just not up there yet.
A Rank:
Kyogre

- Pretty straightforward but it can do what it has been doing every other format, Water Spout in rain hurts and forces multiple water resists on a team. Its bulk is insane too, taking Zacian-C

's Play Rough, and with investment, outside of Electric Terrain, Miraidon

's Electro Drift which gets a boost on super effective hits. Water is a great defensive typing and I think Indeedee-F

will be a unique partner helping against Raging Bolt

and Rillaboom

. I wouldn't be surprised to see Urshifu-R

on these compositions doubling on the pressure and taking equal advantage of it. Kyogre

allows this thanks to being so versatile, can go Choice Scarf, Choice Specs, and Mystic Water effectively. Psychic Terrain isn't a foolproof plan though as the two still hate Raging Bolt

and Rillaboom
Koraidon

- One of my hottest tajes but this is easily a Top 5 restricted Pokemon. Sun is in general great with our fantastic past paradox Pokemon, and Koraidon

's Orichalcum Pulse. The quad Fairy weakness looks bad at first but you're realistically going to Tera your Miraidon against Zacian

and Flutter Mane

anyway. Effectively having 3 STABs is pretty insane, and I have considered a Choice Scarf set to beat Zacian

, Calyrex-Shadow

, Miraidon

, Flutter Mane

. and more, too many times. Even without the Choice Scarf, Koraidon has a superb speed tier and can utilize Clear Amulet to get around the few Pokemon that can slow it down, like Incineroar, or copy Zacian

and partner with Gouging Fire

, which now doesn't even need to sacrifice its item slot to set up fast howls. Unfortunately you do get screwed over if the opponent is also running sun abusers, as they are splashable and sometimes it'll feel like you're not benefitting.
Miraidon

- Honestly find this a toss-up with Koraidon

, Miraidon

individually looks more promising, having a better typing and Special attackers being blessed having not to worry as much about Incineroar, but also Electric Terrain nullifying Amoonguss

' spore. Can't forget Terrain control, which is huge with how great Rillaboom

and Indeedee

are. But Miraidon

is truly missing something: Terrain abusers. The future paradox Pokemon are a lot worse and the list of viable abusers can be counted on one hand. Iron Hands

with an ability sounds hype, and Iron Bundle

seems pretty reliable, but the two are nowhere near as useful as Flutter Mane

and Raging Bolt

obtaining Protosynthesis boosts. Iron Bundle always faces the issue of worse speed control than Tornadus

, and then its damage issue gets even worse in a higher power level format. Iron Hands

would also still hate Incineroar

and Landorus

. Again, Miraidon

is still an incredibly strong Pokemon, but I think its team support is exaggerated and puts it on the same pedestal as Koraidon

.
Lunala

- This is interesting, considering Lunala

's poor typing and underwhelming stats in comparison to everything else, but it makes up for it with its movepool and ability. Shadow Shield is something Lunala

never got to utilize effectively because of both its quad weaknesses, now with Terastallization, it can steal games with Meteor Beam or set up a crucial Tailwind / Trick Room. Yes, Lunala

got Tailwind back, makes it very flexible, and remember, it isn't passive at all thanks to Meteor Beam's Special Attack boost. Wide Guard makes Lunala a complete counter to Calyrex-Shadow

, walling even Tera Blast Fighting variants and allowing for your teammate to clean up. Wide Guard also helps check Kyogre

, Terapagos

, and to an extent, Groudon

. It's annoying how we have minimal good Trick Room abusers and I may be slightly overrating it in Single restricted, especially when it's not as offensive as the others and has to sacrifice Protect.
A- Rank:
Groudon

- Still a great Pokemon in its own right, though notably worse than Koraidon

. Clear Amulet Swords Dance sets can replicate the White Herb sets in the past, but be a lot harder for Incineroar to wittle down. Tera Fire Heat Crash does a number on Pokemon and helps cover the Grass types that threaten Groudon

. Assault Vest sets are also really strong, being able to eat Calyrex-Shadow

's Astral Barrage for breakfast (Often a 4HKO lol, and Choice Specs is usually a 3HKO), Miraidon :Mitaidon:'s Draco Meteor for Lunch (Up to 60%, 3HKO after SpA drops), and Kyogre

's Mystic Water Water Spouts for Dinner (3HKO). Groudon

can partner exceptionally well with Gouging Fire

(Do we realize its strong yet?) which mitigates the Intimidate attack drops and minimizes the switching necessary. Similar to Koraidon

, Gouging Fire

and other paradox Pokemon gain an item slot. Groudon

is just incredible team support and can pull its weight. Average speed tier and opposing Pokemon getting the sun boost will prove to be frustrating for Groudon

players.
Calyrex-Ice

- Trick Room's best abuser, and probably best setter too. Clear Amulet is its saving grace, allowing it to spam Glacial Lance and High horsepower without fear of Incineroar

. Unnerve allows it to ignore Sitrus Berry and its ability makes sure it gets stronger with every kill, just like Calyrex-Shadow

. I do think Swords Dance sets with another Trick Room setter can work well, wiping the board with every Glaciel Lance. Typing is pretty disgusting defensively, which is why we have big Tera to save the day, Water looks the best overall imo though Fire, Grass, and Fairy are worth looking into. Calyrex-I

's bulk is nothing short of amazing, being able to invest to survive Caly-S

's Life Orb Astral Barrage and avoid the 2HKO from Terastallized Ogerpon-W. allowing for Caly-I

to steal endgames even when outside Trick Room. Amoonguss

still sounds problematic and Incineroar

with Knock Off doesn't sound pleasant either, things Calyrex-Ice

definitely needs to watch out for.
Terapagos-Terastal

- Terapagos is the DLC's new 'weird' restricted legendary. Its stats are very mediocre and would suit a Pseudo Legendary, however, it has the special Terastalization formes which bumps its BST up to that of Zacian-Crowned

's, Terapagos-Stellar

. It has 2 good abilities, pre Terastallization it has a superior Multiscale and after that, it can remove weather and terrain, shutting down entire teams when used at the right time. Terapagos

's biggest issue is its underwhelming damage output, because after you Terastallize, you lose STAB on Tera Starstorm and in exchange get a 1.2 boost on all your moves permanently. This is where Calm Mind comes in, Terapagos

can abuse a super supportive team that doesn't want to Terastallize and let Terapagos

do the majority of the damage. The main issue with it though is how inflexible it can be and how vulnerable it is to strong physical attackers, especially Koraidon

and Zacian-C

. Being able to remove the battle effects only once per battle is also unfortunate but the Pokemon is still far from bad.
B rank:
I will be talking a lot less about these Pokemon
because Im tired as they don't have much to offer, they are very mediocre and hard to justify in comparison to the Pokemon above.
Necrozma Dusk Mane

- Necrozma-DM

has a couple of niches with Terastallization, Swords Dance Trick Room sets in particular are pretty scary with Prism Armor, can even just be an unkillable Trick Room setter with Knock Off support. This thing BULKLESS is taking Choice Specs Flutter Mane

's Shadow Ball and Groudon

's Precipice Blades lmao.
Eternatus

- Nice offesnive Pokemon with Meteor Beam and Choice Specs sets being decent. Like 1.3x bulkier than Zacian

and we already mentioned how bulky it is, this takes advantage of how good of a defensive type Poison is and then it can get dangerous when you couple it with a good speed tier. Its stats alone mean you have to give it some credit
Palkia-Origin

- Pretty much better Palkia as they used to run Life Orb and speed investment even on Trick Room sets. Water / Dragon will never be a bad typing and the Pokemon is both bulky and strong. Kyogre's Special Attack stat with a built in Mystic Water has to mean something.
Rayquaza

- Choruto explained this very well, but just very few reasons for you to justify it in your restricted slot. Dragonite

gets recommended because It's a mini Rayquaza

that doesn't sacrifice your restricted slot which can be used on one of the above Pokemon.
C rank:
Reshiram

- Nice Assault Vest Pokemon with glorified Mold Breaker, to my knowledge one of the few Special Attackers that can fight Terapagos

. 150 SpA is never something to scoff at and Fire / Dragon is a nice defensive typing. Pretty good coverage to take advantage of its Special Attack stat ig.
Dialga-Origin :Dialgia-Origin: - Better Dialga, Steel / Dragon is good but looks a bit meh vs this specific metagame, 150 SpA with built in boost is is still a cool tool and I can see this a bit worse than Palkia-Origin
Zacian

- Mini Zacian-C

that can hold Clear Amulet or Choice Band, allowing it to be fearless of Incineroar

and the latter OHKOing Miraidon regardless of Terastallization. Probably almost never worth using but when used, it can be more impactful than all of the restricteds in its tier.
Kyurem-White

- Stats go brr and also glorified Mold Breaker, considering itas a Scarfer and just accepting its defensive downsides. Definitely niche though like everything else in the tier.
Palkia

- Honestly not sure if this should be tier instead, Palkia that can hold an item and function better on heavier Trick Room may be real?
Zamazenta-Crowned

- Usually a supportive restricted so much worse in Single restricted but with Body Press I believe in its ability to fit on a team, Wide Guard, Coaching, Snarl, Howl, etc are still great tools that help justify Zamazenta-Crowned a little.
D rank:
Don't use, trash cybertron thumbnail type shit..