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Let me try another angle...
Xatu (Trick Room setter)
Porygon2 (Trick Room setter)
Ursaring (TR sweeper)
Granbull (TR sweeper, Dragon blocker)
Ampharos (if Megas are allowed - TR sweeper)
Crobat - backup if TR goes down and can't be set back up
There are different possible TR sweepers, too, like Steelix, but I think those are the strongest.