-_- Damnit. So, Great Sage, can you elaborate more about this Fight Arceus?
move 1: Judgment
move 2: Ice Beam
move 3: Recover
move 4: Toxic
item: Fist Plate
nature: Modest
evs: 252 HP / 72 Def / 96 SpA / 32 SpD / 56 Spe
While a Fighting type Arceus seems extremely stupid to use in Ubers owing to the many Psychic Pokemon that exist in Ubers, it is through that very overabundance that Fighting Arceus can thrive. As Psychic resists itself, Psychic attacks are rarely used in Ubers, usually being eschewed for a secondary STAB or another type altogether. Fighting's other weakness, Flying, is nowhere to be seen, and it offers very useful Rock, Bug, and Dark resistances to atone for its certain degree of offensive ineptitude. As a result of its strange typing, Fighting Arceus has become one of the primary building blocks of the Uber stall metagame owing to its consequent ability to safely counter almost all Darkrai and Tyranitar, two Dark types that would otherwise ravage such stall teams. Of course, it is capable of dealing with many other Pokemon as well, such as Groudon and Dialga to some extent. Overall, it is extremely difficult to overcome outside of random Pokemon carrying Psychic attacks, such as a Choice Banded Zen Headbutt Deoxys-A.
The moveset for Fighting Arceus is geared towards countering a wide array of Pokemon and crippling another huge selection. Though many Uber Pokemon are Psychic typed, a Fighting typed Judgment still has its uses on Pokemon such as Dialga, Tyranitar, and Darkrai, and still lands a solid hit on Kyogre and Palkia. As has already been stressed, Ice Beam is an exceptional move to round out almost any special attacker in Ubers; it boasts fairly good type coverage with Fighting to sweeten the bargain. Recover is almost a sine qua non for an Arceus as defensive as this, and obviously serves to maintain its health. Toxic rounds out Fighting Arceus's moveset, allowing it to annoy many would-be counters such as Ho-oh and Lugia; most Steel types wouldn't dare switch in and face a powerful super-effective Judgment.
Careful consideration has gone into the EV spread for this set. Maximum HP gives Arceus a decent amount of overall survivability to begin with. Meanwhile, 72 EVs in Defense used in tandem with maximum HP allows it to survive one Outrage from an Adamant, maximum Attack Rayquaza that has been boosted by both Life Orb and one Dragon Dance; therefore, provided it is kept in excellent health, Fighting Arceus becomes a veritable counter to Rayquaza. The modest Speed investment attains a figure of 290, which outruns all Rayquazas that have not a Speed boost from Dragon Dance, and also keeps Arceus ahead of most Dialga, Giratina, and Groudon. The EVs in Special Attack and Special Defense may appear arbitrary, and one would be correct in thinking them so; the Special Attack is simply a convenient benchmark that achieves a bonus stat point due to the manner in which stats are calculated, and the rest is dumped into Special Defense to provide some degree of buffering in that sector. If one would like, one could easily remove some EVs from the Special stats in favor of a Speed increase to 307, to outrun all Groudon, Kyogre, and such that do not have a Speed modifier, or even to 320, which outpaces all Rayquaza and any Latias and Lugia that don't have a Speed-boosting nature.
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