Vikavolt @ Life Orb / Electrium Z
Ability: Levitate
EVs: 252 HP, 252 Sp.Atk, 4 Sp.Def
Quiet nature (Speed IV 0 or 1)
- Thunderbolt / Discharge / Thunder
- Bug Buzz
- Energy Ball
- Protect
Trick Room attacker Vikavolt. With a Life Orb it hits harder than Mega Ampharos. Vikavolt can be quite useful as an offensive Electric type immune to ground. Thunderbolt is single-target damage, Discharge is spread damage and comes from the Charjabug stage. Electrium Z is an option with Discharge so that you can also pull out a single-target electric move even without Thunderbolt. Thunder is an option for VGC with how common Kyogre is, just don't use it if you run Groudon. Bug Buzz hits Grass types for decent damage, although a lot of them are still hit neutrally because Bug is such a terrible offensive typing (Kartana, Ferrothorn, Tapu Bulu, Venusaur, etc). At least it hits Ludicolo, Lurantis, Serperior, and Tsareena, and Kartana still gets destroyed in one hit by it. Energy Ball is coverage, mostly useful to get rid of ground types like Gastrodon, Swampert, and Groudon, although it lacks the super effective hit on Garchomp and Landorus.
Vikavolt is a powerful attacker in Trick Room and slower than some other staples like Marowak, Hariyama, Dusk Mane Necrozma, and Mega Ampharos, and it only has two weaknesses (as opposed to resistances to Fighting, Electric, Ground, Grass, and Steel). But it lacks a bit in coverage aside from Electric attacks. It does get Flash Cannon and Air Slash as alternatives to what I posted here, but neither are staggering and they do have relatively low base power. Charge is also an option Vikavolt gets, although its bulk isn't quite good enough to fully take advantage of it.
So let's look at Charjabug. The Battery pokémon takes on an entirely different role from Vikavolt. Offensively, it is much more physical than special, but whereas Vikavolt is all about nuking things in Trick Room, Charjabug is much more of a supportive pokémon. Charjabug is quite unique in that it has bulk, offensive support, and speed control all in one.
Charjabug @ Eviolite
Ability: Battery
EVs: 252 HP, 88 Def, 168 Sp.Def
Careful nature
- String Shot
- Protect
- Bug Bite
- Electroweb
Defensive speed control Charjabug for doubles. With an Eviolite, its bulk is relatively similar to Toxapex's bulk so it will usually take several hits before going down (although it lacks recovery unlike Toxapex). And only having two weaknesses helps too. String Shot is Charjabug's most effective form of speed control, reducing the speed stats of both enemies by two stages. Protect is Protect, useful in doubles. Bug Bite removes berries and can give you some very situational recovery if you manage to steal stuff like Amoonguss's Aguav Berry, and Electroweb is a speed control option you can use if you don't need the -2, if you're Taunted, or if you also want to break Sashes and/or Disguise. Battery is the only ability Charjabug has, and it's what sets Charjabug apart from other bulky speed control pokémon like Suicune. A 30% boost to the partner's Sp.Atk is quite big, comparable to a Life Orb. Run Charjabug next to special attackers with average speed tiers like Heatran, Kyogre, Blacephalon, Tapu Fini, Tapu Lele, Mega Gardevoir, or Xurkitree. They love the speed control and they love the extra damage they can do with Battery.