>>41647924I'll name multiple.
-Return of day and night cycle, as
>>41647929 said
-Implementation of touch screen controls and the Poketch
-bigger region than hoenn
-bigger AND better battle frontier/tower area with so much routes and towns it's like its own mini-region
-improving upon FRLG's wireless features
-Wi-Fi
-The GTS
-Flash no longer being an HM
-Bringing in the '2D sprites in a 3D environment' aesthetic, which, in my opinion, is THE best aesthetic for a Pokemon game to this date
-Global Trade System
And that's just what DP brought to the table. If you wanna ask what improvements Pt or HGSS made, I'll list even more.