Brief recap.
Granbull is at least half fairy-type.
Jaw/Sail Fossil (Tyrunt/Amaura’s fossils) are obtained in the town right after you get your first badge, you can choose, your rival takes the other and they also give you a mega stone for aerodactyl.
Leaf Stone doesn’t work on Flabebe. It evolves by leveling up.
Dedenne has a move that drains HP, which may or may not be called Fairy Kiss (unconfirmed). Dedenne is Electric-Fairy type. It is found after the second gym.
One of the towns is called Geosenge town. It’s between the second and third gyms.
Evo stones are available early, including leaf stones, thunderstones, and moon stones. They cannot be bought, however.
Seviper learns a new Poison-type move called Venom Drench. It lowers the Sp. Attack and Speed of a poisoned pokemon. 20/20 pp, no BP, accuracy 100. It’s unknown if any other pokemon learn it.
Josh rode a Rhyhorn, and it can break boulders in its way without using any HMs. HMs exist but are barely needed (so far). Cut, Strength, and Surf are all HMs; Rock Smash is a TM.
Pancham evolves by having a dark-type pokemon in the party when it reaches level 31. Josh used Sableye to accomplish this.
Sawk is basically confirmed to be X exclusive, and Throh is Y exclusive. Axew may be X exclusive, and if it is, then Bagon is Y exclusive.
The daycare is after the first gym, and you can deposit two pokemon right away.