Oscarus

That's why I prefer having Chansey in my team for defensive support and Toxapex for such defensive trick moves.

Then, question... Where should I put them? 

I already have bulky supporter (and annoyance) in Dusclops, which.... true, it can't heal itself, but its' moveset is perfect: setting up Trick Room, burning enemy, constant damage (Night Shade) and Bulldoze to slow my Pokemon, with them taking almost no damage, and activate Tyranitar's Weakness Policy. 

And Porygon2 is very effective both as Trick Room setter, and universal bulky attacker: with Tri Attack, Thunderbolt and Blizzard, the only Pokemon that resist it are Magnemite line, Togedemaru and Shedninja. But... those Pokemon are so rare in Doubles, they can be excluded from the calculations. 

Neither Chansey nor Toxapex learn Trick Room, so that's another detriment for them - my team focus more on hyperoffense and overwhelming opponent, not stalling the heck outta them. Plus Toxapex gets shut down by Taunt as well, leaving it with just Scald (while Dusclops has Night Shade and potentially Bulldoze when paired with Tyranitar, and Porygon2 has lots of offense) and exposed to attacks. Even Smogon agrees with me - Toxapex is in "Below DUU" tier of Gen 7, because while it is excellent in Singles, very mediocre in Doubles. 

I do have some Pokemon to replace in case something went wrong, like Reuniclus for Trick Room or Aegislash for offense outside of Trick Room, but as of right now, I don't see any need to change that.