General: Arceus is generally more offensive with this spread stat. It has good bulk but it's slightly worse than 100/100/100. Its speed tier makes it easier to deal with when running offensive teams since it lacks the speed to outrun base 100 Pokemon and some other Pokemon like Genesect, Hydreigon and Urshifu. High Horsepower and Bulk Up are replacements for Earthquake and Swords Dance since tanking hits some a weaker move or less boosts is easier to deal with. The IoA tutor moves have different uses and not every move has much of an effect for every forme, except for Corrosive Gas and Flip Turn which gives it a Knock Off clone and a pivoting option.
Compund Eyes gives it the option to run Focus Blast, Thunder, Blizzard and Fire Blast as better coverage moves since their drawback are mitigate by a little bit. Toxic and Will-O-Wisp are also guaranteed hits if the target isn't immune to them.
Unaware combined with its solid bulk makes it a good check to set-up sweepers on offensive teams and defensive teams can use it to check dangerous wallbreakers and set-up sweepers like Deoxys, Mewtwo, Necrozma, Lugia and Calyrex-Shadow.
Dragon is a nice set-up sweeper with Bulk Up/Calm Mind and Shed Skin which helps it set-up against defensive Pokemon more safely. While the change to Roar of Time is not impactful, Spaciel Rend and Scale Shot are nice moves to utilise for its set-up sets. Not being permanently crippled by status is also nice for defensive sets.
Teravolt has more limited use on Arceus. Ignoring Thundurus-Therian's and Zeraora's Volt Absorb is nice and ignoring Flash Fire from Heatran while using Flamethrower or Levitate from the likes of the Latis, Giratina-O and Hydreigon while using Earth Power. Defeating Unaware Clefable is also nice for a set-up sweeper.
Aroma Veil is nice for a bulky Pokemon since it can't be taunted, encored or disabled, allowing it further support its team with Defog, SR or status or setting up with Calm Mind or Bulk Up.
Being a Pokemon that is a prime target for status so Guts is a nice way to abuse it. However it depends on your opponent statusing Arceus with WoW, Toxic or Scald, since it activate it for itself.
A Fire-type that can spam its Fire STAB without being concerned about Heatran is nice. Reshiram gives it competition since it has a better typing, higher SpA and the ability to hold Specs or HDB. Arceus is bulkier and has good better coverage so it has that going for it.
Checking weather teams is a nice niche to have eventhough it is quite situational. Otherwise its good solo coverage and immunity to Toxic Spikes makes it a decent SubCM sweeper with Judgement or SubBU sweeper with Dual Wingbeat.
Poltergeist, Shadow Force and Judgement with its high attacking stats force out many Pokemon and paired with Shadow Tag it can rack up a lot of damage on opposing Pokemon.
Standard defensive Pokemon with Natural Cure and its solid bulk. Grass helps it check many Pokemon like Calyrex-S, Zekrom, Kyogre, Groudon, Palkia, Landorus, Urshifu, Zygarde and Rillaboom.
It has a good match-up against Ground-types and being able to trap Pokemon like Garchomp, Groudon and Zygarde is really nice for teammates like Heatran and Electric-types. Trapping Gliscor and Landorus isn't possible because of their typings but it is able to check them thanks to its bulk and coverage.
The extra chip damage is appreciated and while it isn't as support oriented as Ninetales-A, it's still nice support for Arctozolt and act as a secondary breaker. Since Triple Axel isn't a bad move either, it can run physical and special sets to great effect.
Ekiller does your Ekiller things, but now it can't boost with SD and thus has to utilise Bulk Up and the lesser power and accuracy of High Horsepower over Earthquake hurts. Trace can copy some nice abilities like Intimidate from Landorus or Regenerator, but has some niche uses.
Not as bulky as Pex and not as offensive as Nido or Gengar, but it is in a nice middle ground and unlike those other Poison-types, it has a better match-up against Steels thanks to Corrosion and its coverage.
Prankster helps it mitigate its lower speed with Substitute helping it against faster defensive Pokemon or defensive Pokemon with Prankster, Will-O-Wisp and Recover helping against physical attackers that are faster or slower priority users and either Calm Mind or Bulk Up helping it tank more hits. Lead sets with Stealth Rock and Tailwind also appreciate Prankster.
With Solid Rock it is able to better check Flying-types like Ho-Oh, Rayquaza and Lugia since it resists their coverage moves. Furthermore, it gets a special defense boost in Sand, which makes it either a good support Pokemon or Wallbreaker that can check Special threats.
Steel has a great defensive profile and thanks to Mirror Armor, it can punish Intimidate users and Pokemon whose STABs have a chance to lower its stats like Liquidation or Crunch. Other than that, it excels more in a defensive role rather than an offensive one.
Water Veil + Knock Off immunity makes it a really good Toxapex, Alomomola and Tapu Fini switch-in and with Refresh, it can also struck off Toxics or Toxic Spikes. Other than that, it can help check Greninja, Kyogre, Dracovish and Swampert.
Rusted Sword - Raises attack 1 stage when this pokemons health reaches 1/4 or lower
Rusted Shield - Raises defense 1 stage when this pokemons health reaches 1/4 or lower.
Paulluxx, ViZar