I wasn't entirely sure where to post this, but I encountered it in Pokémon Y, and it's certainly interesting, so it seems appropriate here.
Generally when you go upstairs in the hotel in Camphrier Town you encounter a few travelers from foreign regions (and occasionally Mr. Bonding), but this one was particularly interesting. He was a backpacker from an undisclosed region, and he said this:
"The Kalos region is nice and all, but you should really check out my region! We have this town that you wouldn't believe... Ah, never mind. You'll see it in due time."
Now, up until that last part, it sounds like a perfectly normal throwback to a previous generation.
It's become standard to have a handful of references, and you'd expect nothing less from a place like Camphrier Hotel, which plays host to a lot of foreign guests.
But the last sentence:
"You'll see it in due time." I'm not going to go all
'OMG Hoenn remakes confirmed!!1!' But I think it's definitely a hint at something. Unfortunately I didn't have the good sense to take a picture of the screen, so unless anyone else has encountered this man, you might have to take my word for it.
If this is more appropriate in a different thread or a different topic, please let me know, I haven't posted here in a while. I just had to share this because it got me quite excited.