unanswered XY/ORAS Pokédex/form editing

[Timeboy]

Is is possible to add forms where a Pokémon either has several forms already, or has none? I have some edited models that I'd like to show up in the Pokédex as purely cosmetic forms. The first two examples have multiple forms already - Purple Flower Floette, and a Camouflage Pattern Vivillon. The other is a little more complex (I presume) - several coloured Greninjas based on real tropical frogs. I would like to be able to flick through the Pokédex and see all the named forms.

I know actually creating Pokémon beyond the 721 isn't possible, but what about forms? I haven't seen anyone do it yet, but I don't know if that's because it isn't possible or because nobody cares.