>>26976215I don't know about evidence, but this guy gave a good argument for Sylveon being a new type, if not necessarily fairy, as a logical guess.
I had ducked out from /vp/ by this point in the pre-XY hype, so I don't recall when the Fairy-type predictions began getting made. Predicting Fairy in particular had little evidence, but it was a pretty good guess Sylveon was getting a new type, given the keep away with that information the teasers played.