How many times do I have to repeat myself, this is the third time now that I've said I know his move set sucked. I also stated further that this was the only person who agreed to use Darkrai against me, if you want to play against or use a better Darkrai then do it and provide the log. Restalkers are a very viable counter against Darkrai, Heracross and Machamp are perfect examples.
The point I was making, in case you missed it, is that despite the bad moveset, you only had an 11% chance of 2HKOing him.
Essentially, what I was saying was that it was a terrible example, but the main point of my post, the bit you ignored, was that there is other testing that should be finished first.
EDIT: I'm not in the mood for a heated debate on this subject, Darkrai would have gone down, but the majority of the time in the example you gave he would have taken Heatran with him.