Nidoqueen who run Sheer Force generally run special, and Nidoking is generally better with the same set. Something like this:
Nidoking @ Life Orb
Ability: Sheer Force
EVs: 252 SpA, 4 Def, 252 Spe
Timid Nature
- Sludge Wave
- Earth Power
- Ice Beam
- Fire Blast/Flamethrower/Substitute
I would definitely drop Nidoqueen as the -SpA nature is pretty bad, and if you want another one, try to get Timid/Modest.
On D. Zard, replace Phantom Force and Lunar Cannon, Sludge Wave/Bomb is good here to kill Fairies, and either Flamethrower or Frost Breath for the last slot. Also, replace Outrage with Draco Meteor or Dragon Pulse. I personally would use Draco Meteor, especially since you’ll be clicking Shadow Ball 75% of the time for neutral coverage, though Dragon Pulse can do that too. I personally prefer having that 1 time nuke, but it’s up to you. Invest EVs to max out his SpA and Spe.
Lucario should probably be physical, I would hunt an Adamant/Jolly one if you could. The reason for this is that most of your team are special attackers, and Extreme Speed is really good to destroy weakened teams. Here’s a set:
Lucario @ Life Orb
Ability: Inner Focus
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Close Combat
- Meteor Mash/Extreme Speed
- Bullet Punch/Extreme Speed
Delta Noivern is an interesting one. Good defensive typing, but rather frail. Honestly, it’s outclassed in almost everything compared to D. Snorlax, but I’ll provide sets for both.
Delta Noivern
Delta Noivern @ Choice Specs
Ability: Chlorophyll/Solar Power
EVs: 252 SpA, 4 SpD, 252 Spe
Timid Nature
- Energy Ball/Petal Dance(More BP, locked into for 2-3 turns)/Giga Drain(recovery, less BP)(Grass Knot works, but it’s more stiuational, but it helps vs things like Hippowdon. And Mamoswine. Now that I think about it, most of the E4 have several heavy pokemon, but the other have more consistency.)
- Flash Cannon
- Heat Wave
- U-Turn/Boomburst
Delta Noivern @ Life Orb/Leftovers/Occa Berry
Ability: Chlorophyll/Solar Power
EVs: 252 SpA, 4 SpD, 252 Spe
Timid Nature
- Nasty Plot
- Energy Ball/Giga Drain/Grass Knot
- Flash Cannon/Boomburst
- Heat Wave
Delta Snorlax
Delta Snorlax @ Leftovers
Ability: Thick Fat
EVs: 188 HP / 144 Def / 176 SpD
Careful Nature
- Bulk Up
- Seed Bomb
- Drain Punch/EQ
- Synthesis
Delta Snorlax @ Leftovers/Sitrus Berry
Ability: Thick Fat
EVs: 252 HP, 252 Atk, 4 Def
Adamant Nature
- Belly Drum
- Seed Bomb
- Earthquake/Drain Punch
- Synthesis/Drain Punch
Personally, I would drop Giratina and Mew for Gyarados or Scizor, maybe even Mold Breaker Excadrill.