Been trying out a few builds in regular hackmons, but I have found 2 set-ups that might work well in BH as well.
Wobbuffet @ Red Card
I have found that Wobbuffet to work nice if forced to switch in on a substitute.
Obviously, the Red Card is meant to activate while Imposter is active.
Conkeldurr @ Leftovers
Trait: Magic Bounce
I know that there are more powerful pokemon to use as a build up, but not too many are expecting a Fighting type to do it. I have found that people are not sure how to counter this without rushing their strategy and making mistakes.
For regular hackmons, normal type wonder guard. Screw imposter and pure power...