Oscarus

I have some dilemmas. I want to restart playing Gen 7 Doubles in online competitive... but I'm tad afraid that I can't build truly proper Trick Room team 

Could you... give your own opinions or something about it? 

If there is no specific stat in IV section, that stat has automatically 31 IVs

Dusclops (M) @ Eviolite  

Ability: Pressure  

EVs: 252 HP / 4 Def / 252 SpD  

Calm Nature  

IVs: 0 Atk / 0 Spe  

- Trick Room  

- Will-O-Wisp  

- Night Shade  

- Bulldoze  

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]  

Stakataka @ Assault Vest  

Ability: Beast Boost  

EVs: 252 HP / 252 Atk / 4 SpD  

Lonely Nature  

IVs: 14 Def / 0 Spe  

- Gyro Ball  

- Rock Slide  

- Stomping Tantrum  

- Zen Headbutt  

Milotic (F) @ Leftovers  

Ability: Competitive  

EVs: 252 HP / 252 SpA / 4 SpD  

Quiet Nature  

IVs: 0 Atk / 0 Spe  

- Ice Beam  

- Scald  

- Dragon Pulse  

- Protect  

Porygon2 @ Eviolite  

Ability: Trace  

EVs: 252 HP / 252 SpA / 4 SpD  

Quiet Nature  

IVs: 0 Atk / 0 Spe  

- Trick Room  

- Tri Attack  

- Thunderbolt

- Blizzard  

Tyranitar (M) @ Weakness Policy  

Ability: Sand Stream  

EVs: 252 HP / 252 Atk / 4 SpD  

Brave Nature  

IVs: 0 Spe  

- Rock Slide  

- Stomping Tantrum  

- Protect  

- Fire Punch  

My usual leads are Dusclops and Tyranitar. 

On round one, Tyranitar uses Protect while Dusclops sets up Trick Room (thanks to being immune to Fake Out, that makes it easier to do) 

Then, usually, on 2nd turn I'd use Bulldoze to slow down Tyranitar, and activate Weakness Policy, doubling the Attack. Minimal Attack investment is necessary to minimize done damage to it. Fire Punch on Tyranitar is to ensure OHKO'ing Pokemon like Kartana, Ferrothorn and some variations of Celesteela. 

But if opponent's lead Pokemon is Incineroar, they usually, after Fake Out, use Parting Shot. Then I'd swap out Tyranitar for Milotic, who with Competitive would have it's Special Attack increased by 3 stages total. Bulky and very offensive Water type would get its' job done. 

Stakataka's EV/IV spread might seem a little weird, but that's because to have its' Attack higher than Defense, therefore having Beast Boost boost its' Attack, not Defense. Unchecked, it might wreck havoc. 

Mega Camerupt has that specific IV set to be able to use Hidden Power Grass - for wider coverage. Alternatively, I could use moves boosting its' Special Attack like Growth. But I wanted some Grass attacks to deal with bulky and annoying Water types, who also could threaten it. 

Porygon2 is another Trick Room setter, but instead of being pure Support like Dusclops, its' offensive Pokemon, with moves to spread annoying status conditions, and to deal with unexpected and overall irritating Pokémon like Celesteela. Alternatively, I could have it run Toxic, but let's see how that set works. 

If you have any changes, don't be afraid - I'll take any critic.