Hi. I’ll give some advice I guess
Arceus
Set looks fine. I don’t think Tera Ghost is that useful though. Tera Fire to avoid burns is good. You could also replace Earthquake with Double Edge if you wanted and make Arceus Tera Normal. I think an Adamant nature is better wall-breaking + Extreme Speed boost. Zacian-C already provides great Speed control.
Deoxys-Attack
Change Psychic to Pyscho Boost, Taunt or Spikes. You won’t be alive for long so the damage increase from Psycho Boost outweighs the Special Attack drop. Taunt is good for opposing leads like Glimmora or Ribombee and also prevents stuff like Zacian-C from setting up on you for free. Spikes are just more hazards. Talking about Spikes though, I think your team would benefit from using Spikes over Stealth Rock so I would change that slot if you run something else besides Spikes in slot 1. Thunderbolt should be replaced with Icy Wind so you don’t completely lose to Deoxys-S leads and also to prevent stuff from setting up easily thanks to the Speed drop. Tera Psychic isn’t really that useful. I would change that to either Ghost or Steel. Ghost blocks Extreme Speed. If you pick Ghost, change Dark Pulse to Shadow Ball to get the STAB boost. Tera Steel is to block Mortal Spin from Glimmora.
A set like this is probably best:
Deoxys-Attack @ Focus Sash
Ability: Pressure
EVs: 4 Def / 252 SpA / 252 Spe
IVs: 0 Atk
Tera Type: Ghost / Steel
Timid Nature
- Psycho Boost / Spikes / Taunt
- Spikes / Stealth Rock
- Icy Wind
- Shadow Ball
Zacian-Crowned
Four attack Zacian-C isn’t very good because if you’re forced to swap out you do no damage without a boost. Also, Swords Dance is a broken move. Replace Play Rough with Swords Dance. Wild Charge is also mandatory since Kyogre is all over the tier. I would replace either Crunch or Sacred Sword with it. If you keep Crunch, make Zacian-C Tera Dark. If you keep Sacred Sword, replace it with the more powerful Close Combat and make Zacian-C Tera Fighting.
Iron Bundle
Iron Bundle doesn’t have the breaking power needed in this tier and can’t really take advantage of the hazards well. Also, this set specifically looks like threats like Lunala can easily set up on it. This is a pretty boring suggestion, but Koraidon is by far the strongest Mon in this tier and your team does not have Koraidon so you know… putting Koraidon over Bundle will greatly improve your team. The typical Swords Dance Scale Shot set is pretty broken.
Koraidon @ Loaded Dice
Ability: Orichalcum Pulse
Shiny: Yes
Tera Type: Fire
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Flare Blitz
- Scale Shot
- Taunt / Close Combat
Chien-Pao
I guess Chien Pao is more usable than Bundle, but your team doesn’t have a very solid defensive backbone. Chien Pao also has a Stealth Rock weakness. I’m not exactly for sure what Ability Shield does here. I know this is HO, but you want to have some answers to stuff like Agility Lunala and Dragon Dance / Trick Room Necrozma-DM. Adding Kingambit patches this up and provides better firepower than Chien-Pao.
Kingambit @ Dread Plate
Ability: Supreme Overlord
Tera Type: Dark
EVs: 56 HP / 252 Atk / 200 Spe
Adamant Nature
- Swords Dance
- Kowtow Cleave
- Iron Head
- Sucker Punch
This set also does well into stall if positioned well.
Eternatus
This is fine, although Tera Fairy is the preferred Tera to beat opposing Eternatus, block Scale Shot Koraidon, and catch Scarf Koraidon off guard. Also, Fire Blast is typically better than Flamethrower. You could also use Agility Meteor Beam Lunala in this slot to have a better answer for Scarf Koraidon, at the cost of a Toxic Spikes absorber.
Hope this helps!
