QC: TONE114 / galbia / Anty
GP: The Dutch Plumberjack / Rhythms
Seviper's large movepool allows it to hit the entire PU tier for neutral or supereffective damage. Its decent Attack and Special Attack allow it to hit bulky Pokemon for both physical and special damage, and its good ability in Infiltrator allows it to take on Substitute users such as Ninetales and Gourgeist-S. Poison is also a very good defensive typing to have in PU, as bulky Grass- and Fighting-types are common and this allows Seviper to deal with them more effectively. On the downside, its low Speed along with horrid defenses make it easy to KO, and it is easily worn down by residual damage due to its lack of reliable recovery. Seviper also faces heavy competition from other Poison-types such as Arbok and Victreebel, which have niches over it, such as Intimidate and Sleep Powder, respectively.
name: Choice Scarf
move 1: Sludge Bomb
move 2: Earthquake / Flamethrower
move 3: Giga Drain
move 4: Switcheroo
item: Choice Scarf
nature: Naive / Timid
evs: 4 Atk / 252 SpA / 252 Spe
Sludge Bomb allows Seviper to hit even neutral targets very hard, and it is boosted by STAB; it also has a chance to poison the foe, discouraging switch-ins. Earthquake is used to take on bulky Fire-types such as Ninetales and Flareon as well as Probopass. Alternatively, Flamethrower allows Seviper to hit some Grass-types, namely Roselia and Gourgeist-XL. Giga Drain is used to hit Ground-types such as Piloswine and Golem for more damage, as Ground-types resist Sludge Bomb. Switcheroo is used to cripple bulkier Pokemon such as Lickilicky and Grumpig, which Seviper can't take on well.
A Naive or Timid nature along with a Choice Scarf and maximum Speed EV allows Seviper to be as fast as possible, outspeeding Zebstrika and anything slower than that. A Naive nature should be used with Earthquake while a Timid nature should be used with Flamethrower. Maximum Special Attack EVs used maximize Seviper's damage output. Seviper makes use of Infiltrator to hit Pokemon behind a Substitute such as Gourgeist-S and Poliwrath.
Seviper should be brought in against weakened foes to revenge kill them with the help of Choice Scarf, but it shouldn't be brought into strong attackers, as it's very frail and most likely won't survive even neutral hits. Seviper can be brought into some resisted hits, such as Tangela's Giga Drain and Poliwrath's Vacuum Wave. It should, however, preferably be brought in after a KO or via a slow pivoting move such as U-turn, Volt Switch, or Baton Pass. Seviper can also be used as a late-game cleaner thanks to its high Special Attack and Attack along with a good Speed stat with the help of a Choice Scarf. Seviper should also be wary of locking itself into certain moves that could cause it to become setup fodder; for example, if it were locked into Sludge Bomb, Pawniard can set up a Swords Dance against it.
Entry hazard setters such as Dwebble and Probopass are great partners for Seviper, as Stealth Rock, Spikes, and Toxic Spikes allow Seviper to more easily break through bulkier Pokemon such as Lickilicky and Grumpig; with Stealth Rock, Seviper can OHKO Jumpluff and Raichu with Sludge Bomb and Earthquake, respectively. Probopass is an overall great partner for Seviper, as it also provides a slow Volt Switch, providing Seviper with a free switch in. It also traps opposing Steel-types with Magnet Pull, allowing Seviper to spam Sludge Bomb, and provides Stealth Rock support. Simipour is a good partner for Seviper, as it lures in Pokemon such as Lickilicky and Grumpig, hitting them with Low Kick and Knock Off, respectively. Wallbreakers such as Ursaring and Stoutland make for great partners, as they can clean up in the late-game.
Seviper can make use of a Life Orb all-out attacking set to maximize its wallbreaking capabilities, although such a set is outclassed by Victreebel. Sludge Wave can be used over Sludge Bomb to deal more damage, giving Seviper a higher chance to OHKO Pokemon such as Jumpluff, although Seviper misses out on the chance to poison. Seviper can run a fully physical moveset with Poison Jab, Earthquake, Aqua Tail, and Sucker Punch to take advantage of its base 100 Attack and to lure in special walls such as Lickilicky and Grumpig. Knock Off allows Seviper to lure and hit Grumpig, Misdreavus, and Roselia, dealing good damage or removing an important item. Glare is an option that allows Seviper to cripple faster Pokemon on the switch, but then Seviper misses out on a coverage move. Seviper can use Taunt to prevent status from opposing Pokemon such as Thunder Wave from Togetic or to prevent the use of indirect moves such as Stealth Rock and Swords Dance. Toxic can be used to cripple bulkier Pokemon as they switch in and wear them down, although running it causes Seviper to miss out on a coverage move. Final Gambit can be used to KO or weaken a Pokemon greatly, although Seviper instantly faints.
Checks and Counters
**Special Walls**: Special walls such as Lickilicky, Regice, and Grumpig are able to take hits from Seviper very well; the former can use Knock Off to wear Seviper down and constantly heal itself with the use of Wish, Regice can take hits and retaliate with Ice Beam, and the latter can scare Seviper out with Psychic.
**Ground-types**: Ground-types such as Piloswine and Stunfisk are able to take the majority of Seviper's attacks and retaliate with a super effective attack, while both of them can take advantage of Seviper by setting up Stealth Rock.
**Ghost-types**: Ghost-types such as Misdreavus and Dusclops resist Seviper's STAB move and can beat it one-on-one.
**Psychic-types**: Psychic-types such as Kadabra and Duosion can easily take on Seviper; the former can survive any hit with its Focus Sash and KO Seviper, while Duosion can survive any hit and KO Seviper with Psyshock.
**Faster Pokemon**: Faster Pokemon such as Choice Scarf Mr. Mime and Choice Scarf Simipour can outspeed Seviper and KO it.