EDIT: After getting great advice from the posters below, I have been testing out a lot of options for my team, and I think I've finally found the final version of my Trick Room team. I'm really happy with it, and am having a lot of success with it on PO. So without further ado...
Bubblegum (Slowbro) @ Leftovers
252 Hp / 252 Def / 4 SpD
- Slack Off
- Trick Room
This is my lead. Trick Room gets the ball rolling. Flamethrower deals with Forretress leads, Ferrothorn (which is an often switch in, as they think they can wall me and KO with Power Whip. Not so.), Skarmory and Scizor. Scald deals with Hippowdon leads that try to set up, and Aerodactyl leads that try to Taunt me. I experimented with Confarigus, Dusclops and Whimsicott as my lead ‘Trick Roomer’ but have had by far the most success with Slowbro. Trick Room teams require a lot of switching in an out, and her ability Regenerator combined with Slack Off and her natural bulk make her very durable and allows her to switch in multiple times during the battle to set Trick Room up, whilst being more than capable of getting a few cheeky KO’s herself. Overall, I feel she is a great Pokemon.
Mother (Marowak) @ Thick Club
252 HP / 252 Atk / 4 Def
- Stone Edge
- Fire Punch
- Double Edge
Marowak is a favourite of mine from the very 1st Gen and she is right at home in my Trick Room team. Thick Club doubles her Atk, so with Trick Room she hits fast and hits hard. Earthquake puts a huge dent into anything neutral, and outright KO's most things that are weak to Ground. Fire Punch for Ferrothorn, which is often brought in to wall her; Forretress; and more importantly, Skarmory. Stone Edge for the likes of Gyarados , Togekiss etc. Double Edge is beastly and is for anything that Earthquake and Stone Edge don’t deal with.
Voldemort (Reuniclus) @ Life Orb
252 Hp / 252 Def / 4 SpD
- Trick Room
- Focus Blast
This is my second Trick Room setter who is more than capable of a sweep himself. This thing is a beast. Even without any SpA investment and Calm Mind he still packs a huge punch. Focus Blast for things like Zoroark, Lucario, Heatran, Scrafty and Psychic for everything else. Recover to keep him alive longer as I need those Trick Rooms! One of my favourite Pokemon this Gen, without a doubt. Life Orb for the damage-free extra power, as I'm not running Calm Mind.
Talon (Druddigon) @ Life Orb
252 HP / 252 Atk / 4 SpD
- Dragon Claw
- Fire Fang
- Sucker Punch
Druddigon is a beast whilst Trick Room is in play. Switches in on other dragons whilst they are setting up or using a non-Dragon attack, and then priority Dragon Claw them for the KO. Works a charm. Superpower for annoying Dark types that are threatening to two of my Trick Room setters, whilst it also deals with the likes of Cloyster etc, standard stuff. Sucker Punch has saved my *** countless times from Gengars/Alakazams/Azelf etc, particularly when they are switched in when the Trick Room has faded. Fire Fang gets a nice boost with Sheer Force too that can deal with enemy Scizors, Gensects, Jirachi etc etc etc.
Qwerty (Porygon2) @ Eviolite
252HP /252SAtk / 4Def
A newer member of my team. I've had enormous success with this guy. His Normal typing allows him to switch in to Shadow Balls aimed at Reuniclus and Slowbro. Ice Beam for Dragons, Thunderbolt for the likes of Gyarados and Vaporeon. With Eviolite, this guy is bulky as hell and can take a lot of hits as well as dishing the damage out himself, with his decent SpA stat and awesome coverage. Recover to keep him alive longer. He is also my counter to Volcarona and Genesect, both of whom I was having trouble with - they would be switched in the turn Trick Room faded and would then outspeed and KO both my TR setters with Bug Buzz leaving the rest of my team slow and susceptible to a brutal sweep. Porygon2 is more than capable of taking hits from either of them, allowing me to set Trick Room up again. This guy really does play a vital part in my team.
Atlas (Conkeldurr)@Macho Brace
The last member of my team has been chopped and changed a lot. In this place I've tried the likes of Machamp, Escavalier, Rhyperior, Gigalith and Scizor, amongst others. I basically want a huge hitting sweeper, capable of OHKO's or putting massive dents into anything bulky. This guy is the best at that. Brave natures, STAB'd Hammer Arm, with Iron Fist, Macho Brace and max Atk EV investment destroys a lot of things, even if it's not very effective. This guy is an absolute monster, and I'm definitely sticking with him. His design is really cool too, and he's got to be one of my fave 5th Gen Pokes.
So there it is, my newly updated Trick Room team. Rate away, and as ever, been brutally honest - but constructive. I'm really pleased with this team, it's probably my favourite team I've ever made, and one of my most successful too. Let me know what y'all think!