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Alright, shut up, I have discoveries.
xy_doc\trunk\ポケモンモデル仕様管理\kujiraポケモンモデル_仕様管理表.xls is a massive document detailing 3D shader requirements/information for every Pokemon in the game. It also has the codenames for every XY mon. Can't date it due to the way the SVN extracted, and I'll look at Megas in a minute. Couple of discoveres just from this image:
>Even more confirmation of a wiped mid-evo for the Bergmite family (Ice1 goes to Ice3, slot inbetween missing)
>Zygarde's codename is PokemonZ, akin to the codenames of Xerneas and Yveltal (PokemonX and PokemonY respectively)
>Missing slot between PokemonZ and Pinkdiamond (Diancie), presumably the scrapped mythical