Oscarus

I'm asking, because I have analyzed and created new team - which is created to counter any anti-Trick Room leads, especially fast Taunts or Fake Outs

Stakataka @ Steelium Z  

Ability: Beast Boost  

EVs: 252 HP / 252 Atk / 4 SpD  

Lonely Nature  

IVs: 14 Def / 0 Spe  

- Rock Slide  

- Gyro Ball  

- Stomping Tantrum  

- Trick Room  

Camerupt (M) @ Cameruptite  

Ability: Solid Rock  

EVs: 252 HP / 252 SpA / 4 SpD  

Quiet Nature  

IVs: 30 HP / 1 Atk / 30 SpA / 1 Spe  

- Heat Wave  

- Earth Power  

- Ancient Power  

- Hidden Power [Grass]  

Togekiss (F) @ Iapapa Berry  

Ability: Serene Grace  

EVs: 252 HP / 4 Def / 252 SpA  

Quiet Nature  

IVs: 0 Atk / 0 Spe  

- Follow Me  

- Air Slash  

- Heat Wave  

- Dazzling Gleam  

Milotic @ Leftovers  

Ability: Competitive  

EVs: 252 HP / 252 SpA / 4 SpD  

Sassy Nature  

IVs: 30 HP / 1 Atk / 30 SpA / 1 Spe  

- Ice Beam  

- Scald  

- Hidden Power [Grass]  

- Protect 

Cresselia (F) @ Mental Herb  

Ability: Levitate  

EVs: 252 HP / 164 Def / 92 SpD  

Sassy Nature  

IVs: 0 Atk / 0 Spe  

- Trick Room  

- Psychic  

- Moonlight  

- Helping Hand  

Tyranitar (M) @ Weakness Policy  

Ability: Sand Stream  

EVs: 252 HP / 252 Atk / 4 SpD  

Brave Nature  

IVs: 0 Spe  

- Rock Slide  

- Protect  

- Brick Break  

- Fire Punch  

Mega Camerupt and Tyranitar - the most reliable members - are without any major changes; Tyranitar has different offensive moveset, but that is it. I do consider giving Camerupt Protect, to "summon" Water attacks and bait them to hitting either resistant Milotic, or Weakness Policy Tyranitar, but as of right now it doesn't seem necessary. 

For Milotic I replaced Dragon Pulse with Hidden Power Grass, to deal with other bulky Water types which would wall it. I've experienced it before; in one battle there was Milotic vs Milotic at the very end... and it was ultra long. 

For other Pokemon... Porygon2 and Dusclops stopped being reliable; especially when opponent had Taunt. For that I wanted to introduce replacements for them: Cresselia and Stakataka

I am aware that Cresselia basically screams "Trick Room team"... but so does Dusclops. And that Legendary Pokemon is bulkier than even Evolite Dusclops, thanks to Base HP which is 3 times bigger! 

One could say that it isn't THAT better, because it's also weak to Knock Off, and vulnerable to Taunt, while not being immune to Fake Out. Well, I have the solution for two of the three:

• Fake Out is very hard to counter if not a Ghost, but if the opponent aims at the offensive Pokemon, it should be fine 
• Knock Off is boosted only once; without item it isn't as strong, even if used by Max Atk Incineroar
• Taunt can be repelled with Mental Herb; one-use item which nivelates the effect of moves like Taunt, Disable, Encore, Torment, etc.  If Cresselia isn't hit by Knock Off before it is used, it can counter opponent trying to counter my Trick Room setting

Moonlight and Helping Hand (either of them being able to be replaced by Protect) are for utility, and Psychic (eventually Psyshock) to actually do damage in case something goes wrong (taunted AND blocked at once, f.e.) 

Stakataka isn't as obvious of a Trick Room setter as Cresselia, so it won't be a target of Taunting. But it might be Fake Out'd... or hit by a x4 Fighting or Ground attack. And since its' IV/EV spread is made to have the Attack be higher than Defense, therefore Beast Boost boosting Attack, it's a bit fragile. Also Trick Room makes impossible to effectively use Assault Vest. But that's where completely new team members joins - Togekiss. 

I'll admit, that's a bit odd of a choice, but hear me out. Togekiss is (almost) perfect choice to potentially lead with Stakataka because of one move - Follow Me. 

Thanks to +2 priority, it will have most of the attacks to aim at Togekiss, who takes excellently all types which Stakataka's weak to - it's immune to Ground, double resistant to Fighting, and only neutral to Water, which if they aim at it, I can switch Togekiss to Milotic or Tyranitar. The only attacks that won't redirect are those with higher priority (only Fake Out), those with the same but on faster Pokemon (First Impression, Extreme Speed, Faint; all uncommon in Doubles) or specific ones: Doom Desire or Future Sight. So I think it's fine to have those. 

Alongside it, spread moves of Dazzling Gleam and Heat Wave, plus STAB Air Slash with 60% chance to flinch and Iapapa Berry (or Sitrus) to heal the bulky Togekiss. 

And Stakataka gets Steelium Z... because I don't have any better item on it, except Chople/Shuca Berry (which are too much of a roulette to use), or Life Orb.

I'll see if I made good choices