I don't have a lot of experience with Trick Room teams, but here goes!
I get that the point of a T.R team is to be slow, but if one or both of your setters are KOed it could be game over as your whole team is pretty slow. You might want to sub in a couple of fast mons, just in case.
A Chlorophyll Venusaur won't benefit from T.R as the Chlorophyll boost would be reversed - without T.R up, maybe this could be your speedy? Despite that, you'd need a turn to set up sun to get that juicy speed boost. That could work well with your Camerupt too. Otherwise, just go with standard bulky Venusaur. It's really what you think would work best.
A Reckless Life Orb Emboar will probably lose HP super fast, so making it a rest-talker would be a good idea. You could also try scarfing it and making it non-T.R dependent, but I don't know how high Emboar's speed is so that may not be a good plan. But meh, something to think about!
Try Calm Mind instead of Protect on Reuniclus, or maybe Recover, or both. You'll live a good long time with those buffs! As always with a Psychic type, Psyshock is a good alternative to Psychic, but it really depends on what you think works best.
Cohagrigus is a great mixed tank - fully train it in Sp.Def and HP to start. From there, give it Willowisp to supplement its even higher physical defense while whittling down tougher foes. Nasty Plot is easy to stack with Cohagrigus' great defense, so give it that too. From there, just give it your choice of Protect, Hex, Dark Pulse, Energy Ball, Mean Look, Hypnosis, Dream Eater or HP Fighting. Either stick with the Leftovers or do what I did with mine and give it a Lum Berry - no tank likes status conditions, right? This guy is great cause he functions as both a wall and a sweeper, especially with T.R support.
If Cresselia's gonna be in Singles consider either Moonlight (to heal itself) or Lunar Dance (to heal your team).
Lastly, once again I'll say you'll need some fast Pokèmon if T.R can't be set up.
Hope I helped!