It might be a little iffy, but I could see this working on an Azelf setting up SR, and then getting something with Heart of Justice in on what would've been a OHKO Dark attack. By the same token, Starmie or Gyarados into a Motordrive 'Mon would work, although Gyarados might not have the speed to get the first attack and actually do some damage. But, even if you are slower, changing a OHKO into something beneficial would be worth the loss of a move, wouldn't you think?