This is Swanna's best set for the NU environment. Boasting two STAB moves that benefit greatly from rain and a great Speed stat, Swanna has immense potential as a sweeper. Surf is the primary STAB move, getting a power increase from rain. Hurricane is Swanna's secondary STAB move, and it boasts a high 120 Base Power, perfect accuracy in rain, and a 30% chance of confusing the foe; this is something that even the most defensive Pokemon in NU struggle to handle if they don't resist it.

For the final two moveslots, you should use the combination of either Rain Dance and Rest or Substitute and Roost. With the former, Swanna can heal herself to full HP at any time as long as the rain she provides is up thanks to Hydration, making her much more self-sufficient. Alternatively, the latter lets Swanna heal without rain up and ward off status with Substitute. Substitute also lets Swanna take advantage of obvious switches and dodge Sucker Punch. The downside of this combination is that once rain subsides Swanna doesn't have a way to summon it again, preventing her from healing herself if she is inflicted with a status and from boosting the power of her Surf and accuracy of her Hurricane.

While Leftovers is great for healing off damage Swanna takes, Swanna greatly appreciates Life Orb's increase in power; any damage she takes can easily be healed off with Rest or Roost anyway, making Life Orb the superior option in most cases. Big Pecks and Keen Eye aren't useful abilities in this metagame, making Hydration the only viable option. Ice Beam can be used for extra coverage, although it's usually not worth the slot in the long run, as it only deals with Altaria, which isn't common enough to justify running a move for it. Hidden Power Grass can be used to handle Seismitoad and Carracosta, Hidden Power Electric is an option to deal with Mantine and other Swanna, and Air Slash can be used in place of Hurricane if Swanna isn't used in rain.

As this set is best used in rain conditions, partners such as Volbeat and Electrode are great, as they can provide constant rain. Revenge killers, such as Choice Scarf Sawk, can outspeed Swanna and proceed to KO it. Choice Scarf Rotom-S is thus a good ally to handle Sawk and other revenge killers. Zebstrika and Raichu are also good partners, as they can absorb Electric-type attacks that Swanna attracts. Stealth Rock is a problem for Swanna as well; spinners such as Armaldo and Wartortle are good partners for this reason. Mold Breaker Sawk can also prevent Pokemon with the ability Sturdy from setting up Stealth Rock, something that aids Swanna greatly. Lickilicky and Miltank are bulky Pokemon that are difficult for Swanna to defeat; Fighting-types, such as Gurdurr, are good choices to use against them. Entry hazards are great to have on the field to aid Swanna in sweeping. Garbodor and Cacturne are both great Spikes users that also have good synergy with Swanna. Pokemon who can set up Stealth Rock, such as Cradily and Golurk, are good partners as well.