Sorry - ever since I quit RNG I hardly ever check that thread. Anyways, from memory:
I don't recall the frame advancing at all once you're inside the lab and talk to the professor to get your pokemon. I did all my advancements right outside the lab while verifying my seed via emulator. That said, you won't be able to hit something with frame 15 I'm afraid. I meant like if picking the totodile advances the frame by say 8 every time (I forgot what their starting frame was, but I'm sure someone remembers if you ask), then you pick a frame that's like 8 or maybe 9/10 so that once you're saved outside the lab - you hit your seed and just rush into the lab to pick up your pokeball. The rest is pure luck though on whehter or not there were any advancements, etc etc. It can be a HUGE hassle but if you're doing it on a cart, that's probably the only way. Bad idea on a cart imo, but if you're determined enough, lol.