>>51546404To be fair, even Megas weren't announced until only two months before release despite being a major mechanic the generation centered around. You could count Mega Mewtwo, sure, but everyone had just assumed that was another legendary form tacked on later in the same way as Shaymin-Sky.
The issue with comparing it to the reveal of UBs is that Gen 7 was when TPC was at their absolute worst of revealing almost everything about the games, and now that they've dialed that mindset back they could very well be saving paradox forms for either a very late trailer or just keeping them a secret for the launch of the game.
Maybe they could be fake, but after the posted images and the leakers being even more insistent on it than they were for Wiglett, I wouldn't bet on it