"N is a Zoroark".
I get where it came from, with the talking Zoroark in Black 2, N's ability to understand Pokemon, N being found in the wilderness, and N's association with Zorua. However, it makes no sense from a thematic standpoint nor from a logical standpoint.
For me, it has to be that theory that floated around a few years ago that Lorelei and Will are the same person. The person sighted their evidence as "Will and Lorelei share two of the same Pokemon in their parties!" and "their Elite Four Rooms look exactly the same!" as evidence to "point to the theory of them being the same person".
Honestly, no offense to whomever started this theory, but that's just outright dumb, I'm sorry, LMFAO. Lorelei and Will could be related, or something, or probably don't even know eachother. Also, in Generation I and II there's just a limited roaster of Pokemon available, so of course some trainers are going to have Pokemon that are the same as other important trainers.
People just want to find an excuse to explain Lorelei's absence.
I think this is just an extension of fan speculation that Will is transmasculine.
I don't agree with the theory that he used to be Lorelei (Lorelei is way too associated with Lapras to not use it), but it's a cool theory that honestly doesn't clash with
that much of what we're given.