I'm not sure how you can pull this off without becoming very vulnerable. Other than Latios, its users are very slow and would probably be slower than ideal targets, meaning they cant use a setup move until the next turn, meaning for that first turn the opponent can double up on and take out a single Pokemon and invalidate the entire strategy, or the opponent can do some setup of their own. If the target partner survives, there's still the issue that you need to do a setup move, meaning yet again you only have one action while the opponent has two. Might as well just use a setup move twice and get the same effect without having to awkwardly maneuver everything.