Electric is very good.
Must- use Raikou, you need a Set-upper, and a counter for Starmie, who can Rapid Spin.
Must- Trick-Scarf Rotom-H (Trick, Shadow Ball, Pain Split, Overheat). use it to switch-into Starmie's Rapid Spin, or Thunderbolt, and force it would with Shadow Ball. Can be used as an Explosion check, and can KO Azelf and Gengar. If anything, it is great for opposing Tricking Blissey.
Must- Physical Zapdos (Roost, Thunderbolt, Substitute, Heatwave). *Substitute allows you to Roost without fear of EQ*. Both are Immune to EQ, resist Fighting (helps if you have Magnezone), and pack Fire moves to handle Scizor. Toxic can be used over Substitute, and it works great that way to Pressure, and Toxic Stall with Roost. Also breaks down walls like Swampert.
Must- Use Special Defensive Skarmary as Wild Card- EQ Immunity, Resists a lot, works if you plan on using a Volt Absorber/Motor Driver since it lures Electric attacks. (Lanturn and Skarmary help eachother's Weaknesses perfectly). *Sets up entry hazards, physical wall, PHazer.*
That means you have room for 2 more Electrics. Keep in mind the only physical Electrics are Electivire, and Light Ball Pikachu. This is why if you don't use them Skarmary is a must, as the entry hazards help Calm Mind Raikou alot. Otherwise, you rely on Explosion Electrode/Magnezone.
The best choice for the other Electrics are:
Jolteon - Handles Starmie, can use Wish, can Baton Pass (Substitute, Charge Beam, Agility- helps Magnezone)
Magenzone - Hp Fire owns Scizor, Forretress, Metagross, Empoleon, Jirachi, etc. Use Magnet Rise to deal with EQ Metagross.
Lanturn - Can work on a Rain Dance Mono-Electric team. Rain Dance allows it to make up for its low Sp.A. with strong Surfs and Thunders. Rain Dance also helps Skarmary, and/or Magnezone if you use it. Lanturn can in turn also absorb Thunderbolts aimed at Skarmary.
Electivire - Fairly fast, fairly powerful, can handle Tyranitar, Blissey, Heatran, (use Thunderbolt over Thunderpunch), Gliscor, Flygon, and Salamence switch-ins. Hidden Power Fire can also be used for Forretress and Scizor, especially since Electivire resists Bullet Punch. (Thunderbolt, Cross Chop / Fire Punch, Hidden Power Fire / Ice, Ice Punch / EQ). Although Electivire kinda needs Motor Drive to sweep, it can also be Scarfed.
Electrode: Here's what it's good for: Rain Dance, Taunt, Explosion, and Soundproof (handle's Yanmega's Bug Buzz, resists Air Slash, and packs STAB Thunder/bolt). Electivire is what threatens Aerodactyl from getting up Stealth Rocks, because it can Taunt first, and then Thunderbolt 2x to KO it. Also Taunts Spikes Froslass. Electrode is good, if only because you don't have a Rapid Spinner...
*The reason Electric is good is because the lack of Weakness: Earthquake, which 1/2 your team is Immune to, & is all Raikou and perhaps Jolteon, Electivire, and Lanturn (Grass Knot is weak; watch out for Breloom) need to worry about *weakness* wise.
They have good synergy: Skarmary takes physical and resisted Special hits well, sets up Spikes, and can force switches, while Rotom can take Rapid Spin and Normal attacks easily, not to mention Thunderbolts. Skarmary also makes a good Dragon switch-in, like say against Flygon who otherwise threatens many teammates.
Raikou takes advantage of Entry hazards, and any Toxic users, like Zapdos, to break down weakened walls. With Aura Sphere, Raikou becomes even better at KOing Tyranitar. Raikou alone is a great Pokemon.
Zapdos and Rotom counter Scizor, and Metagross, and otherwise can stall or even force switches to rack up entry hazard damage with Trick, Toxic, or Roar. They are great bulky Pokemon to ensure the team sticks around.
The last 2 are left up to the user; Magnezone helps handle Scarf Tyranitar who thinks it can tear thru the team with Crunch (Rotom), EQ (Raikou), Stone Edge (Zapdos), and Fire Blast? (Skarmary). Avoid the EQ and Fire Blast, but handle its STABs and Magnezone can be great, plus if you use Magnet Rise or Substitute on the switch Magnezone has much less to fear.