What if Sylveon is something completely out of left field... I can't remember somewhere, but I read something like:
Going with the DNA mechanic, what if Sylveon has something to do with that?
IE: Combining the DNA of something or something to make Sylveon which could result in a duo-type / something random along those lines.
- Having DNA 'Vials' which are like blood samples from two pokemon to create Sylveon. (Eevee being a prime candidate for this procedure because it already has an unstable genome.)
I mean, what with GF beginning to do some sort of unusual things...
What if Sylveon does have an unusual type, a kind of thing we've never seen before...
But still within the same types we have now.
Something like: A TRI type or even a SPLIT type.
Which, to be honest, I see as more likely than a - light - type at least... :C
But still seemingly unlikely.