Moves
Swords Dance boosts Samurott's solid base 100 Attack to extremely high levels. Waterfall is the most reliable physical STAB move Samurott gets, and it comes with a 20% flinch chance, which can prove useful at times. Megahorn is generally preferred for coverage, allowing Samurott to push past Alomomola, Gastrodon, Slowking, and Seismitoad reliably. However, Knock Off also is a viable option if a more reliable way to deal with Jellicent and Qwilfish is needed; its ability to remove items can also help Samurott or a teammate later on. Aqua Jet is required in the last slot due to Samurott's mediocre Speed. With Aqua Jet, Samurott is able to pick off weakened revenge killers. Razor Shell deserves a mention for its 50% chance to lower the foe's Defense, which can allow Samurott to push past Quagsire, an otherwise difficult task. Waterfall, however, is better in virtually every other situation.
Set Details
The EVs allow Samurott to hit as hard and as fast as possible. An Adamant nature is preferred for the power boost; with it, Samurott still outspeeds prominent wallbreakers such as Exploud, Scrafty, Adamant Emboar, and Clawitzer. Lum Berry is the preferred item on Samurott thanks to the protection it grants Samurott when setting up. Life Orb is a viable option for the increase in damage output, as well as being able to ease Samurott into Torrent range for even stronger STAB moves with the recoil damage. A bulkier spread of 132 HP / 252 Atk / 124 Spe with an Adamant nature can be used to give Samurott some extra bulk while still outspeeding defensive variants of Qwilfish. With this spread, Mystic Water is advised over Life Orb if you want the power boost, as passive damage would be detrimental to such a set. Finally, Samurott can make use of a Rindo or Wacan Berry, which reduce damage taken from Grass- and Electric-type moves, respectively, allowing Samurott to potentially get past the likes of Virizion or Jolteon in a pinch. These are especially useful with the bulkier spread, as Samurott has more HP to work with.
Usage Tips
Samurott typically wants to force out Pokemon weak to Water-types, such as Rhyperior and Mega Camerupt, and use the opportunity to set up a Swords Dance on the switch. Thanks to its high Attack, Samurott can also pick off weakened Pokemon with Aqua Jet if needed. As Samurott can avoid status once thanks to Lum Berry, setting up on defensive Pokemon, such as Alomomola and Uxie, that depend on status to stop Samurott is highly advised. With Life Orb, Samurott wants to preserve as much of its HP as possible to handle Life Orb recoil and priority attacks. Samurott can take some neutral physical attacks during setup with the bulkier spread if it has to. When using a Rindo or Wacan Berry, make sure Samurott is kept in relatively good health so that it can make use of them against Virizion and Jolteon at the right moment. As is the case with most other setup sweepers, you will generally want to avoid using Swords Dance until Samurott's checks and counters are removed or sufficiently weakened. Make sure that faster Pokemon that can usually survive Aqua Jet can be KOed by it or removed entirely before trying to sweep.
Team Options
Samurott appreciates having support from wallbreakers, such as Emboar, Meloetta, and Flygon, most of which also have some defensive synergy with Samurott as well. Pokemon capable of providing paralysis support, such as Uxie, defensive Druddigon, and some Togetic variants, are also useful. Druddigon is the most notable thanks to its Grass and Electric resistances and tendency to lure in bulky Water-types, especially Alomomola, for Samurott to set up on. However, Sticky Web support can also be used in place of paralysis support, so Sticky Web users such as Smeargle can also make for good partners. Without Knock Off, Samurott appreciates teammates that can handle Jellicent, as well as Qwilfish to a lesser extent. Pursuit users, such as Drapion, Spiritomb, and Houndoom, make for great partners, as they can remove Jellicent with ease. Most special attackers have little to fear from Qwilfish and can 2HKO it reliably due to its low special bulk, so they also are useful partners. If Samurott doesn't carry Megahorn, answers to Venusaur and Alomomola are appreciated. Fire- and Flying-types, such as Emboar, Delphox, and Braviary, generally force out Venusaur, while Grass- and Electric-types, such as Jolteon and Virizion, generally handle Alomomola well. Though Samurott can handle Grass-types with a Rindo Berry, a check to fast Grass-types such as Rotom-C and Virizion is still appreciated. Rotom-C is usually handled by Grass-types of your own, such as Venusaur and Virizion, whilst Virizion can generally be handled by Sigilyph and Choice Scarf Delphox.