After the pre-battle tintinnabulation is complete, please stare in awe and wondrous presentiment at what is conceivably the best Pokemon in the entire game. His stats are unrivaled; versatility unmatched, and impact unquestionable. As ordained at the shaping of the universe, His purest forme is somewhat deficient in defensive synergy. A lone weakness to Fighting-type attacks is tempered with a sole immunity to Ghost-type attacks. But whether wiping His many creations from the fabric of existence as Extreme Killer or standing as their resolute guardian as Wallceus, the God of Pokemon knows no bounds. Dare not incur Arceus's divine wrath, or else the consequences shall be severe and merciless, and life shall become but an evanescent wisp.
Thanks to Extreme Killer's very good bulk and the priority of His ExtremeSpeed, He is very difficult to revenge kill. Combine it with a base 120 Attack stat, the ease of setting up a Swords Dance, and STAB on said ExtremeSpeed, and you get one of the best late-game sweepers in the entire game, capable of decimating offensive teams and cleaning up weakened defensive teams with ease.
Swords Dance will enhance the power of His STAB ExtremeSpeed to incredible levels. With just a Silk Scarf and Swords Dance boost, ExtremeSpeed is more than capable enough to OHKO even the deadliest of Uber titans, such as Kyogre, Kyurem-W, Mewtwo, Latias, Palkia, and Reshiram.
To repel the Ghost-types that can come in on ExtremeSpeed, Shadow Claw is the preferred option in the third slot for its high reliability. For those that crave more power, Shadow Force is another option. Its power after a Swords Dance is so extreme that even physically defensive Giratina risks being OHKOed without any hazards provided Arceus is Adamant and holding Life Orb; Giratina-O, Ghost Arceus, and Wobbuffet are easily OHKOed. Shadow Force also evades crippling support moves such as Will-O-Wisp during its charge turn, though the charge turn in itself can prove most inconvenient against Lugia and Normal-type Pokemon. For His last slot, Earthquake eradicates the Rock- and Steel-types that could otherwise take an ExtremeSpeed, such as Dialga or Heatran. Brick Break, though less powerful, breaks through troublesome screens and is significantly more effective against Bronzong, Ferrothorn, Skarmory, and Wallceus. Recover improves His longevity and allows Him to act as a pivot at the detriment of coverage.Team Options & Additional Comments >>>
Standing up to the might of fearsome Uber titans, Wallceus can function as a nearly unbreakable wall. His Defense is so formidable that He is one of the best answers to even Extreme Killer. Although His Normal typing isn't exactly the holy grail of defensive typings, He stands out from His other formes with a lone weakness and the ability to hold Leftovers.
To keep the physical attackers at bay, Will-O-Wisp is the preferred option. It disables nearly every physical sweeper in Ubers—Groudon, Rayquaza, physical Arceus, Garchomp, and Zekrom, to name a few—with a crippling burn. However, Will-O-Wisp's accuracy is shaky and does nothing to Fire-type Pokemon like Ho-Oh. If these issues are bothersome, Reflect is a better option. Although it lasts only five turns and can be canceled by Brick Break, Reflect does not miss, benefits the whole team, and can affect physical attackers behind a Substitute. Recover provides reliable recovery and lengthens His staying power, while Return provides a solid STAB attack that increases offensive pressure. It also enables Him to defeat Extreme Killer without the need to phaze.
For His last slot, both options are useful for their utility against setup sweepers. Roar is the preferred option as it immediately phazes any threat that tries to set up, most notably physical attackers that have been neutralized by Will-O-Wisp or Reflect. It also weakens most switch-ins provided that there is sufficient entry hazard support. For those willing to take a longer approach, Perish Song is a better option. Although it takes three turns to have an effect, Perish Song will virtually guarantee an eventual switch and will place an inevitable end to last-Pokemon setup sweepers such as Calm Mind Arceus.Team Options & Additional Comments >>>
As befitting His stature, Arceus can utilize a Choice Band set to devastating effect. His value is not only in His ability to revenge kill threats such as Darkrai, Ho-Oh, and Rayquaza with a stronger STAB ExtremeSpeed, but also His ability to lure the common checks of Extreme Killer.
Utilizing the fact that Arceus is often assumed to be Extreme Killer, Bandceus can Trick a Choice Band to the incoming check, granting an opportunity for another sweeper to press their newfound advantage. After being Tricked a Choice Band, defensive answers like Skarmory and Lugia are turned into complete liabilities. However, Trick must be used with caution, for it is generally a one-way street. As such, it is critical that prior to using Trick, double switching is used to confirm the intended target is actually sent in.
Bandceus's remaining slots are dependent on His intended role. If sweeping potential is desired after His Choice Band has been Tricked, Swords Dance and one additional coverage move allows Him to take on a persona similar to Extreme Killer, albeit limited in coverage. Coverage moves can include Earthquake, which deals with Rock- and Steel-type Pokemon, or Shadow Claw, which deals with Ghost-types. If better coverage at the cost of sweeping potential is desired, both Earthquake and Shadow Claw combined will suffice.Team Options & Additional Comments >>>
With His extraordinary movepool and His second to none stats, Arceus can fill almost any role. He could run a Calm Mind or Work Up set to utilize His excellent stats. He could run a Perish trapping set with Perish Song and Whirlpool. He could run a dual screens set in combination with Light Clay. He could run a Choice Specs set, a specially inclined version of the Choice Band set. Or He could run a Swords Dance Last Resort set to obliterate anything that is not a Ghost-type. For all intents and purposes, the choice is entirely up to you.
Unfortunately, due to Species Clause, only a single Arceus is allowed on a team at a time. As such, the opportunity cost of running such sets will be high. Indeed, these sets are unorthodox for a reason: the Calm Mind and Work Up sets have horrible STAB coverage in comparison to other Arceus formes; Perish trapping is extremely unreliable in Ubers; dual screens is best left to other Pokemon; the Choice Specs set lacks power plus utility; and the Last Resort set requires a considerable amount of support. That being said, if these sets are of particular interest, then feel free to use them.
Checks and Counters
Should you see Arceus on Team Preview, it is critical to rule out the presence of Extreme Killer before letting your answers to Him become compromised. While there is no true counter to Extreme Killer outside of Unaware Quagsire, there are four that can easily deal with Him for the most part: Skarmory, Wallceus, Great Wall Giratina, and Multiscale Lugia. All four of these checks can either stall Extreme Killer to death should they be healthy or phaze Him in the scenario that they are weakened or unwilling to risk a possible miss. However, even the toughest of checks can fall to the right move or item, albeit in circumstantial situations. Toxic Skarmory falls to non-rain Overheats and Fire Blasts and has to be wary of last-Pokemon +6 Brick Breaks. Faster, boosted, Life Orb Brick Breaks overpower Wallceus, while last-Pokemon Lum Berry Brick Break variants are problematic should He be running the shaky Will-O-Wisp. Similarly, Giratina bows down to a boosted Shadow Force, last-Pokemon Lum Berry Shadow Claw variants, or last-Pokemon Recover variants with Shadow Claw. Reflect + Toxic Lugia is overwhelmed by boosted Life Orb Shadow Claws after Stealth Rock. All of them must also watch out for the rare Bandceus that can Trick a crippling Choice Band.
Rather than pseudo-countering Extreme Killer, it is easier to keep Him in check using multiple Pokemon through concerted means. For example, although Choice Scarf Terrakion cannot switch into Earthquake, it can easily survive a boosted ExtremeSpeed and revenge kill with Close Combat. However, should Arceus manage to survive, a combination check can be used to finish Him off. Offensive Ghost Arceus is an excellent example, as His immunity to ExtremeSpeed allows Him to revenge kill weakened Extreme Killer. With smart combinations of both strong and lesser checks, the application of high pressure to limit setup opportunities, and careful conservation of these aforementioned checks, it is more than possible to deal with Extreme Killer.
Thanks to priority Will-O-Wisp and Foul Play, Sableye is an excellent check. However, it will lose to sun-boosted Life Orb Overheat or Lum Berry Earthquake variants after Stealth Rock. Support Ghost Arceus can be used similarly to Wallceus, but the lack of Leftovers, a strong attacking move, and His weakness to Shadow Force and Shadow Claw makes Him the lesser check. Physically defensive Groudon and Hippowdon are very effective phazers, but can be worn down. Rock and Steel Arceus can also use a support set like Ghost Arceus, but the weakness to Earthquake and Brick Break is quite unfortunate. Likewise, Fighting Arceus favors an approach similar to Terrakion, but obtains reliable recovery and bulk at the cost of power and the resistance to ExtremeSpeed. Thankfully, Arceus formes that carry Plates are very effective against Bandceus, though they dislike taking super effective attacks.
Although it loses to Brick Break and non-rain Overheats and Fire Blasts, a physically defensive Bronzong can stall many variants. Along the same lines as Terrakion and Fighting Arceus, other revenge killers can include Choice Scarf users such as Dialga and Heatran or Swift Swim users such as Kabutops and Omastar. However, they are generally less effective due to their weather dependency or lack of power. A physically defensive Giratina-O variant can survive any boosted move bar Shadow Force or possibly Dragon Claw and either Will-O-Wisp or phaze Him out. It also has an immunity to Trick, which is handy against Bandceus. Choice Band Landorus-T and Scizor can tank a boosted attack and inflict severe damage or possibly OHKO with Superpower, but have to be perfectly conserved. An utmost conserved physically defensive Forretress can triumph using Toxic and Pain Split, but will still lose to Fire Blast and Overheat. It also loses to Life Orb or Lum Berry Earthquake variants, but is still able to cripple Him. Similarly, physically defensive Ferrothorn is an annoyance with Leech Seed and Iron Barbs, but performs best when used as a combination check. If all else fails, faster Pokemon that are immune or resistant to ExtremeSpeed can attempt to use Destiny Bond, Trick, or Explosion to stop His sweep, but it will almost always result in their loss. Similarly, although no Intimidate user can truly stand up to Extreme Killer, the Attack drop might allow others to defeat Him.
It should be noted that as Wallceus is more inclined to defeating answers with attrition, He necessitates a very different response than that of Extreme Killer. Thanks to STAB Fighting-type attacks and Recover, Fighting Arceus is Wallceus's best counter. Fire Arceus is similar and has an immunity to burn, but lacks Fighting Arceus's consistent damage. Despite its vulnerability to attrition and lack of reliable recovery, stallbreaker Heatran shuts down any Wallceus that lacks the obscure Earthquake thanks to Taunt and Toxic.
Any other answer to Wallceus is either easily worn down, can be phazed before significant damage is done, or is vulnerable to Return. Magic Bounce Xatu can switch into any move besides Return after Stealth Rock or Ice Beam and proceed to completely wall Arceus. Heracross can take advantage of a possible Attack boost through Guts, allowing it to pulverize Him with Close Combat. Reshiram and Victini roast Arceus with their powerful STAB Fire-type attacks. Blaziken smashes Him with Hi Jump Kick or sun-boosted Flare Blitz, but has to be mindful of Reflect. Strong special attackers such as Kyogre and Kyurem-W are particularly threatening due to Wallceus's lack of specialization against special attackers. Should the weather be sun, Ho-Oh can switch into any move but Return after Stealth Rock and proceed to deal considerable damage with Sacred Fire. However, Reflect variants actually wall Ho-Oh despite the sun boost, though the possible burn is an annoyance. Support Pokemon that can inflict detrimental status effects like Toxic poison, preferably with a method of alleviating status, can be quite effective against Wallceus. However, they are significantly less viable against Refresh variants.