Well I haven't gotten to the point of actually trying to get the mon since I haven't found what my actual starting frame is yet. But the target is still Joltik (using the 0 Encounter slot).Ah, yeah that makes it considerably harder. Idt entering the cave would cause issues with the PIDRNG state, but I'm not 100% sure. Ideally the thing to do would be to run around to advance the IV frame, enter the cave, then use Chatot to figure out where you are by following the calls.
If you want I can take a look and see if I can find where you are. I'd need you to post...pretty much everything so I can replicate your screens on my end. Namely: seed, profile info, what you're after and what mon you got.
The first three mons I encountered using this method were:
Bold Joltik lvl 25 - 0 Advance
Naughty Joltik lvl 26 - 1 Advance
Lax Ferroseed lvl 27 - 2 Advance
The starting frame I confirmed 4 times, and I confirmed the following two encounters twice each.
Thanks for the help though, it's a lot of work :/