Moves
Volt Switch makes Eelektross a great pivot, allowing it to deal damage while taking advantage of entry hazard support to wear down its checks, such as Aromatisse, Druddigon, and Mega Audino, while retaining momentum. Flamethrower lets it hit Grass- and Steel-types such as Venusaur, Virizion, and Escavalier super effectively. Giga Drain deals with Ground-types, such as Rhyperior and Seismitoad, which are immune to Volt Switch, and it also allows Eelektross to recover HP. Hidden Power Ice can be used to hit Dragon-types which otherwise wall Eelektross super effectively, such as Flygon. Knock Off has strong utility, removing Leftovers and Eviolite from defensive Pokemon such as Aromatisse, Alomomola, and Togetic, making it easier to pressure them. Knock Off also breaks the Substitute of Substitute + Calm Mind Meloetta, which otherwise uses Eelektross as setup bait. Alternatively, Thunderbolt can be used in the last slot as a more powerful STAB move that OHKOes Clawitzer and Braviary and 2HKOes Spiritomb and Hitmonlee after Stealth Rock damage.
Set Details
Eelektross needs maximum HP and Special Attack to be an effective pivot. A Quiet nature boosts Eelektross's Special Attack. Assault Vest boosts Eelektross's Special Defense, letting it tank hits from Meloetta, Rotom-C, and special Virizion. Alternatively, Expert Belt can be used to increase Eelektross' damage output. If Knock Off is not used, the 4 Attack EVs can be moved into Special Defense, and a Modest nature should be used instead of a Quiet nature.
Usage Tips
Eelektross should be used as an offensive pivot, switching in and out throughout the match while applying pressure with Volt Switch and coverage moves. If Eelektross has been inflicted with status, it should Volt Switch to a cleric, such as Aromatisse and Togetic. To maintain offensive pressure, Volt Switch to a sweeper such as Hitmonlee, Flygon, Virizion, or Emboar. You should not risk letting Eelektross stay in on hard-hitting foes, such as Hitmonlee and Emboar. Also, make sure that Eelektross doesn't get hit by Knock Off, which will reduce its longevity. If the opponent has a Ground-type Pokemon, you should try to correctly predict the opponent's actions and use the appropriate move.
Team Options
As Eelektross is an offensive pivot, it should have a cleric as a partner in case it takes significant damage or is inflicted with a status ailment; examples include Aromatisse, which can provide both Wish and Heal Bell support, as well as Alomomola and Togetic, which can provide Wish and Heal Bell support, respectively. Entry hazard setters put a lot of pressure on the opposing team, as Eelektross forces many switches, racking up residual damage on its foes. Rhyperior and Bronzong are great partners, as they can set up Stealth Rock. Qwilfish, Roselia, and Mega Glalie can stack Spikes, while the former two can stack Toxic Spikes as well. Wallbreakers such as Life Orb Sigilyph, Choice Specs Rotom-C, and Choice Specs Meloetta can be used, as they appreciate Eelektross' ability to give them a free switch with its slow Volt Switch. Flygon is a great partner as well, as it forms a solid VoltTurn core with Eelektross and lures in Alomomola, allowing it to U-turn to Eelektross to gain momentum and pressure the foe.