I would recommend Whimsicott.
(you can also use aromatisse as 2nd option)
Whimsicott brings you Trick room (guarnteed with focus sash), prankster memento and frailness.
You also can use taunt to stop hazards and set up on your face. You can use last move as attacking move such as moonblast. Here's a set for you:
Whimsicott @ Focus Sash
EVs: 252 SpA / 252 Spe
IVs: 0 HP / 0 Atk / 0 Def / 0 SpD
- Trick Room
But honestly, as the comments said, for speed control use webs. Trick room isn't very good in PU (or any other tier except smogon doubles)
I'm not saying tr is bad, but it's not very viable yet has its niche.
Hope I helped!