Following yesterday's official reveal of new Pokemon, new Alolan forms and Team Skull, the Japanese Pokemon Site added, along with the details of the newly revealed Pokemon, seemingly entirely random pages featuring both Dragonite and Zubat, then sent out this cryptic tweet:
The text effectively translates to 'Dragonite and Zubat arrives in Sun and Moon! Stay tuned to learn more about these familliar Pokemon!", and neither the twitter account nor the official site goes into any more detail on why they've suddenly given prominence to these Pokemon in relation to Sun and Moon.
The most likely explanation, of course, is that they're the next Pokemon to receive the 'Alolan form' treatment - perhaps being limited specifically to Dragonite in its case and presumably the entire Zubat line in theirs? The specific presence of Zubat probably rules out mega evolution, under the assumption that whatever is to be revealed in relation to them is the same for both. If Zubat's line does in fact have an Alolan form all the way through - including Crobat - that would also mark the first non-Gen I Alolan Pokemon too.
The decision to upload these pages prior to any actual announcement about the importance of these Pokemon to the games is a pretty unusual one, even for the Japanese side of the Pokemon hype train. So, realistically, there's also a chance that it could be something entirely different and perhaps unpredictable that they will be revealing in relation to these two Pokemon, rather than Alolan forms... but at this moment all we can really say is that something is up with Dragonite and Zubat in the new games and it's possibly Alolan forms...
We'll update you with any solid facts as and when they appear...