Holiday event maybe 'UNLOCKED' Regional exclusices too?

No, I highly doubt it. Sorry

I think there is probably something hidden, like the gift boxes they saw on the data mining, my guess is that they will contain random items like revives, potions, balls,probably a lure or incense and some eggs that will get you the babies.

But I don't think we are never getting region exclusives, still dreaming about trading someday, that will be the only way for me to complete the pokédex, probably in 2 years they make it, it only took them 6 months to implement mass transfers hahah xD

Very doubtful, but that's very ok for me...I am ok with not catching all of them and think region exclusives should remain region exclusives.

It's not like any of the region exclusives are overpowered and most are relatively weak gym wise.

Even for Legendaries, they should make it very hard to get too so it would be an accomplishment to actually get one (or massive luck, I guess we'd get shinies for that).

I doubt it as well, which is unfortunate. Niantic could at least allow the regionals to spawn at embassy buildings :)

the idea that I'll never be able to complete the pokedex because of this actually weakens the game imo, they should allow it at least during an event like you said.