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>Canon Protags
Red, Ethan, Brendan, Dawn, Hilda, Rosa, Calem, Sun.
>Economics
Sinnoh and Unova are the richest regions in the pokemon world.
Johto and Kanto rejoin by the time of Sun and Moon and Johto, forming one large new region.
The Sevii Islands are the poorest region and are largely abandoned by the time of Sun and Moon.
>Story
2 Timelines
Ultra beasts can traverse across both timelines.
Lance isn't actually the Champion in GSC
Neither is Red
>Misc
The Pokemon war was between Northern Unova and Kalos
X&Y are part of the same timeline as the original games. ORAS and Sun and Moon are part of a new timeline. This is why there are different stories for how Mega Evolution was created.
There is more than 1 "Looker" and the original Looker from Diamond and Pearl is different than the one we saw in B/W and Sun and Moon. Same as the one shown in X/Y
Looker is going to play a huge role in a future game. He will be part of taking down the evil organization alongside the protagonist.
In the Diamond and Pearl remakes the Looker is going to be a different Looker than Looker #1