So anyone got any ideas on RNGing Thundurus? I'm hitting the right seed, but can't get the correct frame for Nature/Shininess. I'm after frame 750: if I do 145 Chatot flips I hit 751 consistently; if I do 144 I hit significantly lower at 725. Assuming it's due to some specific wandering NPC movement. Nothing I've tried so far is getting me out of this pattern.
Sorry to ask again, but I would really appreciate advice, as I'm currently unable to do anything else in my game until I release Thundurus.
Further from this, I've tried a completely different tack: using a timer (I dug out EmLoop!) to count out an appropriate delay towards my target frame (ie. forgetting about Chatot flips, and letting Thundurus' rain advance the PIDRNG by itself).
I figured out I'd need to time about 2.7 seconds to get to roughly the right frame, and have tried changing it from about 2.2 to 3.7 seconds.
The odd thing is that regardless of the time I wait, I get a Hasty nature (and there really aren't many Hasty frames in the vicinity of the frame I'm targeting). This seems to imply that Thundurus' rain isn't actually advancing the PIDRNG at all.
However, as an experiment, I let it just run for half a minute or so, and I did end up with a different Nature. So I have absolutely no idea what to think now.