So after finishing my game with my 6 shiny Pokémon and catching some shiny Legi's and whatnot, I figured it's about time I'd get my shiny roamer. I'm beginning to think I can't hit it because the game skips the frame, but I'm not sure. I'll just show my numbers and work from there.
After doing advances of 0, 10, 20, 30, 40, 50 and 60, I began to notice a pattern where 0, 20, 30, 50 advances seemed to match up quite well with the possible PID frame. With a bit of obvious calcing, I figured I needed to advance around 280-290 frames to get my shiny Roamer.
I'll list the amount of advances and the frame I probably hit. I stopped checking them all because there really weren't many options honestly. My shiny frame is 748.
280 -> 737
282 -> 739
283 -> 744
284? -> 744
285 -> 744
286 -> 750
287? -> 744
288 -> 744
289 -> 743
290 -> 751
291 -> 743
292 -> 750
293 -> 755
The ones with the ? are frames where I think I hit that specific frame but I am unsure because I might have messed up during my Chatot flipping. As far as I know, my mashing is pretty consistent. I don't remember getting a different spread on the same advances (I've done a couple a few times). Should I just try all of them again, until I get it or should I look for a different shiny spread?
Edit: I just checked 281 and seemed to hit frame 766, which is really odd. Guess I'll try again see if I get something else.
Edit 2: perhaps I should just search between frame 700 and 850 and list all possiblities. Maybe I'm just more off than I thought I was...