Amazing read, EonX! Interesting spread, EonX; I never thought of taking out some Spe EVs and place them into HP. Your spread does lose out on Absol, Hitmonchan, and speed-tying with opposing Nidoqueen, but Absol has Sucker Punch, Hitmonchan is shit, and speed ties aren't the best thing to put yourself in. The extra health is definitely worth it, since I've been quite disappointed with her bulk. It's worth noting that Nidoqueen can also tank Entei's Flare Blitz's as long as it's not banded. I'd definitely like to try out this spread.
Just a note, though - you can save yourself 4 SpA EVs, since Nidoqueen's HP from 96 to 92 wont affect Nidoqueen's chance in tanking a LO Fire Blast or Leaf Storm from Moltres or Sceptile.
You mentioned Shadow Ball for hitting Uxie extra hard, but it's also worth noting that it OHKOs Rotom (after SR), too, which are on the rise.
Here are some sets that I've tried / have been using:
Toxic Spikes
Nidoqueen @ Life Orb
Trait: Sheer Force
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature (+Spe, -Atk)
- Earth Power
- Toxic Spikes
- Fire Blast
- Thunderbolt
People frequently use Nidoqueen for setting up SR, but it is one of the most effective Pokemon to set up TSpikes. The reason is simple - Nidoqueen threatens every Poison-type with its Sheer Force special artillery! Earth Power (and Timid) for opposing Nidoqueen and Drapion and Fire Blast for Amoonguss, Roselia, Scolipede. Fire Blast and Thunderbolt are also targeted at Steel-types and Flying-types unaffected by Toxic Spikes. Don't forget that Rapid Spinners wont enjoy spinning in front of Nidoqueen, either!
TSpikes is an underrated support move. It softens up the opponent's defenses effectively, allowing powerful threats, such as SubRoost Moltres and SubDD Crawdaunt much harder to stop. It's great against offensive teams, too - putting LO Sweepers on a shorter timer.
Rain Partner
Nidoqueen @ Life Orb
Trait: Sheer Force
EVs: 4 HP / 252 SpA / 252 Spe (or ideally EonX's spread xP)
Modest Nature (+SpA, -Atk)
- Earth Power
- Sludge Wave
- Thunder
- Focus Blast / Stealth Rock
This is the standard Nidoqueen with Thunder > Thunderbolt. Still, Nidoqueen's amazing complementary combination with Rain Offense should not be ignored. Rain sweepers have trouble getting past Slowking, Lanturn, Tangrowth, Ferroseed, Poliwrath, and maybe Munchlax. Nidoqueen hits all of them hard with respective special moves! If she foregoes Focus Blast, it can set up Stealth Rock, which are tough to squeeze in on a Rain team.
Nidoqueen is also useful on Rain teams, because it is a solid check to most Electric-types, not named Specs Rotom-C and EQ Electivire. Against Rotom-C, it can usually do a 1-vs-1 trade-off, tanking a Leaf Storm with a sliver of health in exchange for killing Rotom-C with Sludge Wave.
Other than the moves already suggested, Ice Beam > Sludge Wave is worth mentioning, since it lets Nidoqueen hit Roselia and Amoonguss hardest, as well as severely crippling Druddigon.