Thank you. :-) That answers one of my concerns. I understand that finding the exact time will be tedious, but I'm not really worried about that.
I've seen this check code mentioned and also MTIVRNG mentioned on the RNG Research thread, but never was MTIVRNG explained (what does MTIV stand for?) or where to find the check code (is it somewhere in RNG Reporter?). I'm doing my breeding on a retail card without the use of an AR just now, and my ROM files are run on an M3 DS, which doesn't yet run the AR codes on Gen 5 (black screen, game won't load when codes are set to on).
Do you know where to find this check code?