>>26473785-seasons
-weather forecasts and weather being more important
-longer routes
-deeper caves
-higher mountains
-vaster ocean
-denser forests
-less tiny towns
-less story
-less railroading
-online mode which employs the same rules as battle facilities (fuck Mega Ray and Primals)
-breeding Pokemon always passes down the highest IV stats
-confusion damage is a set percentage
-6 move slots
-more battle bgm options for battle facilities plus unique battle bgm
-split people who battle online between people who want to have team preview and those who don't
-you can look for battles with people close to your age
-Little Cup online mode
-easy tournament hosting with battle rule options
-text chat for trades and battles
-more GTS filters and options
including:
-option to seek out trades looking for a Pokemon you have
-option to filter out specific Pokemon asked
-option to filter out trades looking for any and all legendaries
-challenge mode
-promised "amazing battle facility" since XY being actually amazing
I could probably go on for a long time, but you get the idea. Love the series since the beginning, but they'll need to improve on its somewhat dated mechanics a lot.