From a comment on Reddit:
"I would agree with you that the original consensus that 50% was based on Nidhogg. But now seeing that 10% and 100% seem to have connections to Fenrir and Hel respectively, serpent Zygarde has to be based on Jormungand based on the fact Nidhogg has nothing to do with...
I'm only a collector, but I'm excited to get more Pokemon for my living card Pokedex!
Good thing I've been working overtime lately. Those Mega Charizard are gonna really hurt my wallet... >.>
RE: Leaks / Rumors / Speculation Thread - Don't post topics that have their own thread!
The seventh gym could be Poison, Ghost, or Dark. The eighth is almost certainly Ice.
RE: Rumors and Speculation (Potential Spoilers)
With some leakers saying they have Charizardite X, this makes me think that this could be a legitimate alternate (shiny) Mega Charizard.
EDIT: Nath'd. >.>
RE: Rumors, Speculation and Potential Spoilers
I only wish it were real.
Source: http://neliorra.deviantart.com/art/The-Stoat-Fakemon-259526807
Ninja'd. :/