I'll list the most common ones for each tier (including LC! lets not forget)
LC: Slowpoke, Munna, Porygon, Bronzor
- all are good users of Evolite, able to tank many hits, especially because of advantageous typing & abilities, in addition to reliable recovery moves for the 1st three
NU: Musharna, Beheeyem
- Musharna has decent bulk, access to some good moves like Calm Mind, Moonlight, Baton Pass & Dual Screens
- Beheeyem doesn't have very good defences, but being so slow, it can set up Trick Room itself and sweep, since it has a base sp. atk of 125, which is scary for OU, let alone NU
RU: Uxie, Slowking, Dusknoir & Whimsicott
- Uxie has really good bulk, access to Stealth Rock, Dual Screens, Heal Bell, Trick
- Slowking has good sp. def, Slack Off, Regenerator, meaning you can use it again to set up Trick Room
- Dusknoir again has good bulk, a spin blocker, good immunities, access to Pain Split & Will-O-Wisp
- Whimsicott isn't a common Trick Room set up, but because of Prankster it'll still go first in most cases, able to Encore trap & Leech Seed stall before escaping
UU: Dusclops, Cofagrigus, Slowbro & Porygon2
- evo. Dusclops makes a very nice wall; good bulk access Pain Split & Will-O-Wisp
- Cofagrigus is arguably a better wall that Dusclops, since it has leftovers recovery, and the ever useful Haze; also can be used offensively with Nasty Plot, Shadow Ball & HP Fighting
- Slowbro is a common UU/OU wall, makes a nice pair with Blissey/ Chansey; Regenerator and Slack Off mean you'll be able to use it more than once
- Proygon2 has very good bulk with Evolite, in addition to a good sp. atk of 105, and though Trick Room would forfeit Analytic, Porygon2 has the benefit of using Trick Room itself in order to sweep
OU (& UU as well): Bronzong, Cresselia
- Bronzong has good bulk & typing, advantageous ability in Levitate, meaning only 1 weakness, access to Stealth Rock, Dual Screens & Explosion
- Cresselia has really good bulk, good support moves like Lunar Dance, Dual Screens and Icy Wind (for doubles)