Okay, starting with Dynamax. Your team has no Pokemon that makes good use of Dynamax, Kyurem's Choice Scarf is disabled when dynamaxed. Bulky Yveltal < Life Orb Yveltal for Dynamaxing.
No good Defogger, so just run a Calm Mind Defensive Arceus. Either Arceus-Water or Arceus-Fairy which one you find important. Physically defensive Arceus-Water for countering Necrozma-Dusk-Mane or Specially defensive Arceus-Fairy. The sets vary from team to team, though I will include one:
> A great defensive typing, amazing bulk, good Speed, and the movepool to take advantage of these qualities all culminate into making Arceus-Water a defensive cornerstone for many bulky teams due to its astounding blanket checking prowess. Notable threats it can check include Arceus-Ground, Ho-Oh, defensive variants of Primal Groudon, Necrozma-DM, and defensive Zygarde-C, as well as Dragon Dance Zygarde-C and Mega Rayquaza if running Ice Beam. In addition, it can pivot into a lot of additional moves, such as Behemoth Blade from Zacian-C and Water Spout from Primal Kyogre. Judgment allows Arceus-Water to pose a threat to the likes of Ho-Oh, Arceus-Ground, Zacian-C, and Mega Gengar while also hitting Necrozma-DM for decent damage, thereby forcing it to waste Morning Sun PP.
These things are dangerous for your team. Set from Smogon:
Arceus-Water @ Splash Plate
Ability: Multitype
EVs: 252 HP / 240 Def / 16 Spe
Bold Nature
- Judgment
- Toxic
- Refresh
- Recover
Alternatively, Will-O-wisp can also be run for crippling Physical attackers.
Set for Arceus-Fairy:
Arceus-Fairy @ Pixie Plate
Ability: Multitype
EVs: 248 HP / 172 SpD / 88 Spe
Calm Nature
- Judgment
- Recover
- Will-O-Wisp
- Defog
You can also run Calm Mind over Will-o-Wisp, it is upon you.
Why Protect on Primal-Kyogre? Run something like Sleep Talk for countering Smeargle and Vivillion or Water Spout if running a fast Kyogre.
Groudon-P likes Rock Tomb much more than Thunder Punch. It makes for his average speed, and hurting Primal Kyogre hard on switch-in meaning it will get beaten next turn from Precipice Blades. Also countering Ho-Oh.
Zacian-Crowned has Psychic Fangs??? For what? Screen are not that much common though. Run Wild Charge for Ho-Oh, Arceus-Water and Primal Kyogre.
No good Dynamax Sweeper....... Run a Life orb set on Yveltal. Here it is:
Yveltal @ Life Orb
Ability: Dark Aura
EVs: 4 HP / 252 SpA / 252 Spe
Rash Nature
- Dark Pulse
- Oblivion Wing
- Heat Wave
- Rock Slide
Note that you can run Modest/Timid instead of Rash if not running Rock Slide. Alternatively, Focus Blast can be used for Tyranitar, or Sucker Punch for Ultra-Necro, Calyrex-Shadow and weakened Marshadow. Also other options can be chosen, such as Knock Off for Chansey or Defog/Taunt. If running Defog, then give Calm Mind to Arceus formes.
Calyrex-Ice is bad, worse, worst. He gets beaten by Yveltal's Dark Pulse. Lagging Tail can only be used once, and not preferred. Run Weakness Policy Calyrex-Ice with Trick Room, or don't use it at once. Run a second counter to Zacian-crowned, Necrozma-Dusk Mane. It all depends on your team, whether you need Weakness Policy and Trick Room/ Dragon Dance/ Autotomise/ Ultra-Burst Necrozma/ Defensive Rocky Helmet. I suggest Trick Room, since when Ditto copies into you, you are always faster, since they are Scarfed and it is Trick Room. There are defensive roles plus offensive. One for defensive:
Necrozma-Dusk Mane @ Rocky Helmet
Ability: Prism Armor
EVs: 252 HP / 252 Def / 4 SpD
Impish Nature
- Sunsteel Strike
- Morning Sun
- Toxic
- Knock Off
For Ultra one:
Necrozma-Dusk Mane @ Ultranecrozium Z
Ability: Prism Armor
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Dragon Dance
- Photon Geyser
- Earthquake
- Stone Edge
This set is highly vulnerable to Ditto, since they outsped you even if you ultra burst. My favorite set is Trick Room set. Which is:
Necrozma-Dusk Mane @ Weakness Policy
Ability: Prism Armor
EVs: 252 HP / 252 Atk / 4 SpD
Brave Nature
IVs: 0 Spe
- Trick Room
- Photon Geyser
- Earthquake
- Sunsteel Strike
