Well, see, the problem is: it likely was not my best Method J frame. I ran the time finder for an enormously huge search of Shiny seeds for every nature(or rather, did two searches: one for sweeper-ish IVs and one for defensive), so I'd have a huge list of possible seeds to consult, and then pick things from there, so I wouldn't have to run a new search every time (I planned on doing more tailored searches for things like near-flawless non-shinies). So nature/syncer weren't specified in that search.
Yep, I find it's best to just do Method 1 for a wide search where you save a copy of the spreadsheet (right click, save as CSV) and then when you actually want to catch something generate with the seed using Method J with a syncher of the nature of what you want to catch.
Also, I did a few more coin flips and got up to 16 correct. So the seed was right.(Still amazed that the seed was right on the thrid try with no practing to figure out how to hit a delay 100 higher than my usual.) Also worried I won't be able to pull it off again... =P
Oh derp...*runs Method J generator* Ok...here it is...Mild, Frame 604. Well, I overshot by 2. =P Bah, thanks. Still not sure what went wrong in my Frame calculation, though--it seemed fairly sound, and I'm certain I didn't miscount the journal flips...
Perhaps you didn't account for there being a capture on the first page? That counts. And after reading below did you get your frame number by generating with a synch nature set and use a sycher of that nature in game?
Do you have any wandering Pokemon loose?
Are you a perfectly precise counting machine? :P
It's a good thing this frame is fairly low...I'm sure it'd be a lot more frustrating to miss something like 4000 by a frame of 2.
... I did have a syncer though. Does having a syncer on a seed that was located without a sync nature specified help, hurt, or have no effect? I swear I read this somewhere, but can't find it.
It hurts, because it is probably NOT going to be what you were looking for and NOT on the same frame. Generate based on what you are going to do in game with regards to a syncher.