Favorite Trick Room Seter

I generally like using Dusclops. I always tend to use it on a double team with Eviolite, pair it up with something like a Claydol knowing Cosmic Power, and give Dusclops Psych Up. I then give it Snatch, and bring out Pokémon which can heal themselves to snatch the healing effect, and effectively keep Dusclops in play.

 

Cresselia 'cuz VGC 2012
( ͡° ͜ʖ ͡°)
[3D='cresselia']

 

[3D='jellicent']

Back in Gen5 Doubles, I used a trick room rain team, and water spout/trick room Jellicent was so much fun to use. Not only is jellicent immune to moves like fake out, with drizzle in effect and a trick room set up, it can deal phenomenal damage with water spout at full health!

 

This is a really hard question for me to answer since I've played full and semi trick room a lot... So I'll go with 2 Trick Roomers, 1 of them the one I find the most memorable and the other one as the one I've used the most and I've had the most success.

1)
Mesprit @ Leftovers
Ability: Levitate
Level: 50
EVs: 236 HP / 188 Def / 84 SpD
Relaxed Nature
IVs: 0 Spe
- Trick Room
- Calm Mind
- Psychic
- Thunderbolt

The reason I'm using the sprite from D&P is because this is the Mesprit I used in my Trick Room pass in Pokémon Battle Revolution( I miss this game :[ ). Alongside a really neat Hariyama with Fake Out to set up Trick Room and then spammed Calm Mind as Hariyama nuked things with Guts boosted(flame orb) Close Combats and then fling to burn physical sweepers(that thing made a lot of people rage quit, mesprit is now a special Tank with 1 or 2 CMs and then you burn their offensive sweeper, GG).

This is the Trick Roomer I find the most memorable for me since it's the first one with which I had some success, and definitely one of the most fun I've ever used.

2)

Cresselia @ Chesto Berry
Ability: Levitate
Level: 50
EVs: 236 HP / 164 Def / 108 SpD
Sassy Nature
IVs: 0 Spe
- Rest
- Trick Room
- Helping Hand
- Protect

Now I now what you're thinking(If you've ever played VGC that is), wait wut, no attacking move? What if they try to Taunt you? Welp, this thing was the key member in my team for 2012's Nationals(in which I top 4'ed meaning I went to Worlds for free) and every single move has an explanation.
The team was based around a Trick Room Excadrill, I was talking with a good friend of mine about what would be the strongest multi target attack in VGC 2012 without stat boost moves such as Swords Dance, we ended up agreeing that Sand Force Earth Gem Helping Handed Earthquake from Excadrill was certainly it, so I made a Team around it, Cresselia was the only Trick Roomer in the Team since that Excadrill needed a lot of set up. I ran so many neat weird sets on that team that caught people off guard that I believe I won most of my games out of sheer wait what?? from my opponents. No attacking moves Cresselia with Protect and RestoChesto, this thing usually lasted the entire game, it setted up TR with one of the 2 Supporters I ran depending on Team match up. It then Helping Handed everything to hopefully nuke 2 of my opponent's Pokémon in one shot, Protect was used to catch my opponents off guard since literally no one ran Protect on Cresselia, this gave me a handful of free turns to knock out stuff. Rest gave Cresselia the extra fuel it needed to get through the last turns of the game.
My other members were a Follow Me Mental Herb Togekiss, which could use Follow Me to ensure Trick Room and could Follow Me predicted Taunts and then recover from them with Mental Herb(wait wut #1) it also one shotted Hitmontop with Helping Handed Aerial Aces. There was also a Hariyama(no fling this time, I ran Rock Slide to ko flying types that were inmune to EQ) which ensured Trick Room thanks to Fake Out and then nuked stuff with Helping Handed Guts boosted Close Combat, that thing one shotted everything! Also Rock Slide was used to take on flying types. The 4th member was a Tyranitar whose purpose was to nuke other members of the opponent's team how? Helping Handed Fling with Iron Ball(wait wut #2) 130 base power + STAB + Helping Hand, this thing dealt so much damage it was ridiculous, it also cut T-tar's Speed allowing it to be even faster in Trick Room, and I do believe it also negated Levitate on levitate users after being flung but don't quote me on that, it also dealt with Flying types with Rock Slide. The 5th member was a Fire Gem heat wave Chandelure which I never used since it was only there to prevent people from bringing Scizor and to an extent Hitmontop to the battle and to deal with Full Trick Room Teams which I didn't face. The 6th member was Excadrill which basically nuked the last 2 members of the opponent's Team with ease.

 

I rather like Reunicles. It gets full coverage with Shadow Ball and Focus Blast along with STAB Psyshock. It can sweep in the Trick Room while taking hits and I love it!

 

I would say either Cofagrigus, Slowbro, or Reuniclus. Don't make me choose. Don't make me choose!

......

Okay, Cofagrigus. He's a beast.