Countering UU/NU Trick Room Teams

Using equally-as-slow Pokemon works. You could also use moves with negative priority, like Revenge and Vital Throw. Those aren't the best examples of good negative priority moves, but they're the first ones I can come up with.

Trick Room doesn't reverse priorities. That being said, moves with priority still go first.

And yes, a second Trick Room undoes the first, but that's not really a reliable counter.