Rate my first ever Nat Dex AG team!

Question

Godzilla (Tyranitar-Mega) (M) @ Tyranitarite
Ability: Sand Stream
EVs: 24 HP / 252 Atk / 232 SpD
Jolly Nature
- Stealth Rock
- Stone Edge
- Pursuit
- Taunt

Works as a great rocks setter. Taunt is great for screen setters and fellow rocks setter. Stone edge is STAB, pursuit if I can predict a switch.

ghost rider (Calyrex-Shadow) @ Focus Sash
Ability: As One (Spectrier)
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Astral Barrage
- Psyshock
- Nasty Plot
- Energy Ball

Special sweeper. The set doesn't need explanation. Focus sash is because this thing is very frail.

doggo (Zacian-Crowned) @ Rusted Sword
Ability: Intrepid Sword
Shiny: Yes
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Behemoth Blade
- Play Rough
- Close Combat
- Psychic Fangs/Wild charge

Psychic fangs is for screen setters. The rest is pretty understandable.

Poseidon (Arceus-Water) @ Splash Plate
Ability: Multitype
EVs: 252 HP / 48 Def / 44 SpA / 140 SpD / 24 Spe
Modest Nature
IVs: 0 Atk
- Judgment
- Recover
- Cosmic Power
- Energy Ball

Its not funny how many times I have made people ragequit after using it. 2-3 cosmic powers makes it tank any hit, not matter how much its power. Both Kyogre and Primal Groudon wall this thing, so energy ball for coverage against them.

lion (Necrozma-Dusk-Mane) @ Choice Band
Ability: Prism Armor
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Sunsteel Strike
- Knock Off
- Earthquake
- Psychic Fangs

I go dynamax on this one, to get the attack boost and still not get the move locked. HP Evs are for tanking most super effective hits.

Groudon-Primal @ Red Orb
Ability: Desolate Land
EVs: 192 Atk / 252 Def / 64 SpD
Adamant Nature
- Precipice Blades
- Roar
- Counter
- Heat Crash

The set is not very good, so I want suggestions.

Thanks, and like I said earlier this is my first ever team so I am sure there are tons of changes to be done.

Comments

Here is the Groudon -Primal set I use
Groudon-Primal @ Red Orb  
Ability: Desolate Land  
EVs: 252 HP / 252 Atk / 4 SpD  
Adamant Nature  
- Fire Punch  
- Precipice Blades  / Earthquake
- Dragon Tail  / Thunder Punch
- Bulk Up

I'd also recommend Rock Polish over Bulk Up but the Attack and Defense boosts tend to be better than the speed boost when I'm playing.

In addition the EV's on Arceus, Tyranitar, and Groudon need to be fixed. My recommendations:

Arceus: 252 SpA / 252 Spd / 4 SpD
Tyranitar 252 HP / 252 Atk / 4 SpD
Groudon 252 HP / 252 Atk / 4 SpD  

With Calyrex I'd just swap Psyshock with Psychic.

Another thing with Arceus is Energy Ball is a pretty useless move for Splash Plate. I'd recommend switching it to Thunderbolt, Flamethrower, or in my opinion the best option Ice Beam.

Also I think Mega-Aggron would be a better option that Mega-Tyranitar. You already have Dusk-Mane but for rocks you'd probably get more use out of this set.
Aggron-Mega @ Aggronite  
Ability: Filter  
EVs: 252 HP / 252 Atk / 4 SpD  
Adamant Nature  
- Curse  
- Heavy Slam  
- Earthquake  / Fire Punch
- Stealth Rock

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Mega Aggron isn't viable in NDAG.

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Thanks for the suggestions @ngclark411.

Your Groudon set seems pretty good, except that heat crash is better than fire punch (999 lbs)

I highly doubt Arceus will need the SpA Evs. Like I said, its strategy is to set up and then recover. Judgement and energy ball are only if it HAS to attack. Also, I use energy ball for coverage against Groudon and Kyogre as both wall it (water evaporates under desolate land).

Is there a particular reason for using Mega Aggron over Mega Tyranitar? TTar-Mega is bulkier than the former with 100/150/120. A focus blast or flamethrower is all it takes for Mega Aggron to faint, not to mention the useful Sandstorm that Tyranitar has.

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First of all I would just like to clarify for the above comment Mega Aggron is available is NDAG. It all comes down to stats and typing. Steel is just better that Rock / Dark. Sandstorm is only beneficial when Tyranitar is out, and with its typing I doubt it will be out long. Aggron is simply in a better position not having a single 2x weakness or higher. Also sandstorm will be a real pain because that Tyranitar will probably faint after 3 turns so all your other pokemon will get hit by a small bit of damage every turn for a little bit. It can really just be more annoying than anything. I have never had my Aggron get Oh-Ko'd ever on a pokemon that was not set up. Tyranitar on the other hand has one of the largest weakness pools out there. And with Arceus run it how you want but it would make for a better mon to run an attacking set along with Cosmic Power like this one. (modified to fit your needs in my opinion.)
Arceus-Water @ Waterium Z  
Ability: Multitype  
EVs: 252 HP / 4 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Judgment  
- Ice Beam  
- Cosmic Power  
- Recover
Z Crystal would probably be better than a plate.

I'm just telling you from a competitive standpoint, you never want to divide evs amoung more than 3 stats. And you always want to max out two stats. Just a statement of opinion but I think it would help you out more.

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I don't think wasting the Mega-slot on Tyranitar is worth it, especially if it's main role is just as a Stealth Rocker (then again, I haven't played NDAG in a while so can someone confirm if this is true or not?)

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@Celestial Shadows I agree with your point

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@Celestial Shadows Tyranitar is a niche Calyrex-Shadow check, only setting Rocks isn’t its job.

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Okay that's what I thought.