<HUGE graphical revolutionization almost full 3D.
<stereoscopic 3D, implemented neatly and that makes use of the out-of-screen effect, other than a deep in-screen one
-Only works in: title screen. single battles. important locations. cutscenes. pokédex.
<new models for every single mon up to that point included new forms
<new menu sprites for every single mon
<new, updated, usually improved cries for every previous generation's mon
<mega-évolution
<animation compartment: multiple high quality battle animations. stance animation. Poké-Amié animations. Mega-évolution animation
<new expression in mons' cries for MEGA-ÉVOLUTION and Poké-Amié
<personalization overload; customizable touch screen background. customizable character. customizable clothes. cuztomizable haircut. customizable lens. customizable poké-amié background & area, obtainable through a gift system, that also works through online functionalities of other trainers' pokémon
<Trainer videos with a huge compartment of variety
<Plethora of online fumctionalities: PSS: wonderful hub to connect with passing trainers' profile, can vastly customize a profile; passing messages; online functions; requests, battles-trades, wonder trade, trainer video exchange; statistic system & compliment message system & stat; happy birthday message system & stat
Big world: numerous routes
Big gap between gyms, especially in west kalos
Big explorable 3D city full of content; lumiose
Day&night system showcased more vastly through dawn&sunset skies
stars, sun and moon visible, also during battles
<important-location/monument customizable photo system
<tip giving system
<restaurants
<new mean of movement: rollerscates
<2-color bycicle
<Fully new, innovated and improved orchestra-like sound compartment
<more references; also in the soundtrack
<Visible high quality full trainer models and their battle/losing/winning animations during battles with relevant characters