Hello. I will rate your team and improve what needs to be improved. For the most part, you already have good Pokemon in Zeraora, Rotom-Wash, Regieleki, and Tapu Koko. However, the movesets of those Pokemon need changing. Zebstrika and Boltund, while they are cool Pokemon, aren't viable in National Dex Monotype. :( I'll explain later in the rate. So, here is the team rate:
Regieleki
Magnet should be replaced with Choice Specs, as Choice Specs gives you more power than Magnet. Rising Voltage should be used over Electro Ball, as while Regieleki is fast, it won't OHKO certain things like Dragapult, while Rising Voltage in Electric Terrain OHKOs it. Rising Voltage in Electric Terrain is a very powerful move. Ancient Power should be used over Thunder Cage, as Ancient Power chips Landorus-Therian and is useful against Lighting Rod Alolan Marowak. Here is the revised set:
am speed (Regieleki) @ Choice Specs
Ability: Transistor
Tera Type: Electric
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Rising Voltage
- Thunderbolt
- Volt Switch
- Ancient Power
Tapu Koko
Tapu Koko is used as a Choice Specs user on Electric teams due to its ability to deal with Dragon, Fighting, and Dark-types. Tapunium Z isn't used on Tapu Koko. Tapu Koko doesn't use Thunder Punch since it is weaker than Thunderbolt. Using Discharge and U-turn is fine on a defensive pivot set, but that is used on Fairy teams. Here is the Choice Specs set:
VGC nightmare (Tapu Koko) @ Choice Specs
Ability: Electric Surge
Tera Type: Electric
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Thunderbolt
- Dazzling Gleam
- Grass Knot / Hidden Power [Ice]
- Volt Switch
Grass Knot targets Pokemon such as Swampert/Mega Swampert, Gastrodon, and Mamoswine, while Hidden Power Ice targets Pokemon such as Gliscor and Landorus-Therian.
Rotom-Wash
Rotom-Wash is used as a physically defensive pivot on Electric Teams. Rotom-Wash doesn't use Shadow Ball and Dark Pulse, and those two moves cover the same things, so having both would be redundant anyways. Hydro Pump and Volt Switch should be used over those two moves. Toxic is fine is you use it over Pain Split or Defog. Will-O-Wisp should be used over Thunder Wave so Rotom-Wash can cripple physical wallbreakers. Rotom-Wash should only use some Speed EVs and not 252 so you can use those EVs in Defense. Leftovers should be used over Rocky Helmet to give Rotom-Wash some HP recovery. Here is the physically defensive pivot set:
washing machine (Rotom-Wash) @ Leftovers
Ability: Levitate
Tera Type: Electric
EVs: 252 HP / 212 Def / 44 Spe
Bold Nature
IVs: 0 Atk
- Hydro Pump
- Volt Switch
- Will-O-Wisp
- Pain Split / Defog / Toxic
Zeraora
I see what you were trying to do with Quick Attack + Plasma Fists, but that's not how Plasma Fists works. Plasma Fists only turns Normal moves to Electric moves for the turn you use Plasma Fists, so using Plasma Fists to make Quick Attack become STAB won't work. Fake Out and Quick Attack aren't good moves on Zeraora in general. The set I'll give you will have Bulk Up and Bounce(will explain in a bit) over those two moves. Drain Punch is fine for healing, but Close Combat is usually preferred since it has more power. Razor Claw isn't a good item, the revised set has Flyinium Z, which works with Bounce in order to allow Zeraora to take out bothersome Grass-types such as Mega Venusuar and Amoonguss. Here is the set:
Zero (Zeraora) @ Flyinium Z
Ability: Volt Absorb
Tera Type: Electric
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Bulk Up
- Plasma Fists
- Close Combat
- Bounce
Zebstrika -> Iron Hands
I replaced Zebstrika with Iron Hands. Like I said earlier, Zebstrika isn't good in National Dex Monotype. You said Zebstrika was supposed to be bulky and take out Rock-types, but Iron Hands is bulkier than Zebstrika and even resists Rock moves. The Iron Hands set I will give you is an Assault Vest set to check special wallbreakers such as Kyurem and Heatran. Here is the set:
Iron Hands @ Assault Vest
Ability: Quark Drive
Tera Type: Fighting
EVs: 252 HP / 4 Def / 252 SpD
Careful Nature
- Drain Punch
- Earthquake / Heavy Slam
- Ice Punch
- Thunder Punch / Volt Switch
Earthquake is nice against opposing Electri-types and Poison-types such as Alolan Muk. Heavy Slam can be used to target Fairy-types. Iron Hands gets an attack boost in Electric Terrain due to Quark Drive. If you want to be more defensive, you can use an EV spread of 4 HP / 252 Def / 252 SpD with 29 Attack IVs to get a defense boost when Electric Terrain is up. The set would look like this:
Iron Hands @ Assault Vest
Ability: Quark Drive
Tera Type: Fighting
EVs: 4 HP / 252 Def / 252 SpD
Careful Nature
IVs: 29 Atk
- Drain Punch
- Earthquake / Heavy Slam
- Ice Punch
- Thunder Punch / Volt Switch
Boltund -> Zapdos
Boltund also isn't good in National Dex Monotype. With the set you have on Boltund, Regieleki does that way better as an Electric Terrain abuser. I already replaced Zebstrika with an Assault Vest Iron Hands, so Boltund isn't needed. I replaced Boltund with Zapdos so the team has a Ground immunity that doesn't get ignored by Mold Breaker. The set I'll give you is a Defog set, which is useful if you don't use Defog on Rotom-Wash. Here is the set:
Zapdos @ Heavy-Duty Boots
Ability: Static
EVs: 252 HP / 148 Def / 108 Spe
Timid Nature
- Volt Switch / Discharge
- Heat Wave / Toxic
- Defog
- Roost
Volt Switch allows you to pivot, while Discharge spreads paralysis. Heat Wave targets Steel-types such as Scizor and Ferrothorn. Toxic is useful to spread poison if you don't have that on Rotom-Wash. Defog is nice to clear away hazards for your team. The EV spread allows Zapdos to outspeed Gyarados without Dragon Dance boosts.
The team revisions can be found here. Also, you cant use Tera in NatDex Monotype, as it is banned. Hope this helps! :)