This generation featured the series' largest graphical overhaul: a shift from two-dimensional sprites to three-dimensional polygons.
Greater emphasis was placed on making Pokémon species more unique and in-tune with the culture and fauna of Europe, namely France.
[2] In these games and their sequels, the player assumes the role of a Trainer whose goal is to capture and use the creatures' special abilities to combat other Pokémon.
Some Pokémon can transform into stronger species through a process called evolution via various means, such as exposure to specific items.
[7] With the games taking place in a region based on France (called Kalos), design inspiration stemmed more from European culture[1] (e.g. the legendary trio of Xerneas, Yveltal and Zygarde have their roots in Norse mythology).
[12] A new mechanic called Mega Evolution—a temporary form change akin to normal evolution—was also added for more dynamic battles and stemmed from the concepts of bonds and evolution.
A variant of Mega Evolution called "Primal Reversion" was introduced in Omega Ruby and Alpha Sapphire; this mechanic is exclusive to the legendary Pokémon Groudon and Kyogre.
Masuda expressed that this effort proved exceptionally difficult as the names have to feel fitting to their physical appearance and not infringe upon any rights.
[17] It is speculated by fans that the designs for the Chespin, Fennekin and Froakie evolutionary lines stem from typical role-playing game character classes, such as those in Final Fantasy.