[Overview]

Awesome offensive Pokemon in NU
Good mixed attacking stats, bulk, and lack of weaknesses make it great
Awesome coverage
Slow, but can use that to its advantage through slow U-turn or Volt Switch
Bulk and lack of weaknesses are less impressive with few resistances

[SET]
name: Ebeltross
move 1: Thunderbolt
move 2: Superpower
move 3: Flamethrower
move 4: Giga Drain
item: Expert Belt
ability: Levitate
nature: Rash
evs: 140 Atk / 244 SAtk / 124 Spe

[SET COMMENTS]

One of its most successful sets
Takes advantage of awesome mixed attacking stats to break through almost every wall and tank in the tier
Effective lure; if you need a particular special wall gone, spam special attacks until they switch in their special wall, vice-versa for physical walls
Thunderbolt for best STAB and to beat bulky Waters (mola, mantine, etc)
Superpower nails almost every special wall/tank in the tier and v strong
Flamethrower to hit Grass-types like Tangela and Vileplume
Giga Drain to hit Ground-types such as Seimitoad and Piloswine

[ADDITIONAL COMMENTS]

Speed outspeeds Alomomola, max SpA, and enough Atk to 2HKO common special walls, such as Regice, Lickilicky, Audino, and Zweilous, w/ Superpower
Bulkier spread of 112 HP / 140 Atk / 248 SAtk / 8 Spd is an option to take hits a bit better if you don't care about outspeeding Alomomola and co.
Always Ebelt because LO only helps secure 2HKO against Altaria w/ Thunderbolt without Rocks up, otherwise pretty much useless
Anything that hates walls (especially special walls) loves this set being around; Ludicolo, Carracosta, Jynx, etc
Spikes support needed to 2HKO Piloswine and Roselia and OHKO specially defensive Seismitoad; Scolipede and Roselia make good partners for this, with Eelektross taking Flying-type attacks aimed at them
Stealth Rock helps get the OHKO on Articuno, Lapras, and Regice; Golem and Seismitoad are both good offensive setters that can keep up momentum for your team while getting up hazards
This set still struggles to bring down the occasional Dragon-type, such as Altaria or Shelgon; Jynx can KO them pretty easily and outspeed after a Dragon Dance from offensive variants

[SET]
name: Special Attacker
move 1: Volt Switch
move 2: Giga Drain
move 3: Flamethrower
move 4: Thunderbolt
item: Choice Specs / Leftovers
ability: Levitate
nature: Modest
evs: 172 HP / 252 SpA / 84 Spe

[SET COMMENTS]

This set uses Eel's awesome special movepool and above average SpA to its advantage
Plays as a hard-hitting attacker/slow scout
Volt Switch gives good offensive momentum and can bring in offensive Pokemon safely without having to bring them in on a revenge or predicted double switch
Giga Drain lets Eelektross take down the Ground-types that want to stop it from Volt Switch-ing
Flamethrower takes down Grass-types that resist its STAB
Thunderbolt for a more reliable STAB to spam

[ADDITIONAL COMMENTS]

Given spread allows Eelektross to outspeed 0 Spe Tangela and avoid a Sleep Powder, though you can use a spread of 132 HP / 252 SpA / 124 Spe to outspeed 0 Spe Alomomola
Choice Specs can be used for a much greater boost power, but Leftovers help it live longer and give it a way of beating Ground-types that switch into Volt Switch without prediction
Expert Belt
HP Ice
Acid Spray to give special walls a really hard time
Swellow, Zangoose, and Ursaring appreciate Eel's slow Volt Switch so they can come in safely to activate their status orbs
Other VoltTurn users are also nice to help keep up momentum; Primeape, Swellow, Probopass, etc can all do this well
Struggles to muscle past common special walls (Lickilicky and Audino, Bastiodon and Probopass), so strong Fighting-types such as Gurdurr or Sawk can beat them

[SET]
name: Physical Attacker
move 1: U-turn
move 2: Thunderpunch
move 3: Superpower / Drain Punch
move 4: Aqua Tail
item: Choice Band / Expert Belt
ability: Levitate
nature: Adamant
evs: 132 HP / 252 Atk / 124 Spe

[SET COMMENTS]

Uses awesome physical atk to its advantage
Coverage options aren't AS good, but still v good
U-turn can't be stopped by Ground-types, so even better at getting momentum
Thunderpunch for STAB and good BP without recoil
Superpower for POWER but Drain Punch works for recovery and if you don't want any stat drops forcing you to switch
Aqua Tail hits Ground-types that keep it from spamming its STAB

[ADDITIONAL COMMENTS]

EVs outspeed 0 Speed Alomomola with the rest thrown in bulk and Atk
Choice Band for extra power, since it can't rely on super-effective coverage as well as other sets can
Expert Belt can still be used to lure in Ground-types and beat them with Aqua Tail
Crunch>Aqua Tail for better coverage against Grass-types—notable Exeggutor—and overall better neutral coverage, though beating Ground-types is pretty important
Wild Charge>Thunderpunch for more power, but then you kill yourself vs Alomomola
Even with Aqua Tail, Ground-types are still a problem, especially Seismitoad and Torterra, making Pokemon such as Serperior or Jynx good partners to take care of them
Once again Eel serves as a good slow scout, so Swellow, Ursaring, and Zangoose appreciate getting their status orbs activated through a slow U-turn
Certain physical walls—Tangela, Seismitoad, etc—can still wall this set fairly well, meaning strong special attackers, such as Charizard and Exeggutor, can help defeat these Pokemon

[Other Options]

Not a whole lot; has awesome coverage but that’s been covered
Coil, though it usually prefers the immediate power of the other sets
Zap Cannon + Coil is bad
Acrobatics to beat Grass-types, but it prefers a more beneficial item
Rock Slide, does little for coverage
Knock Off
Thunder Wave/Toxic

[Checks and Counters]

Hard to directly counter, since it’s strong and a bit unpredictable
Easiest way to beat it is to outspeed/revenge kill it, but mostly just to keep up offensive momentum so as never to give it a free switch
Choice Specs/Band users (Sawk, Charizard, etc) can hit it super hard
Dragonair and Shelgon are the closest things to an all-around counter
Camerupt, Ampharos, and Zweilous can wall the special set well
Lickilicky and Audino can come in on any move from the special set and stay in and wall non-Choice Specs variants and pivot out into those that are
Fraxure can set up on special set
Torterra, Tangela, Seismitoad can all wall physical set pretty well, but all but Tangela dislike the passive damage from U-turn