In the Black and White chapter of PokéSpe, Bianca's Pokédex breaks early on. Once it's fixed, she gives it to White. A similar case happens with Serena and Bayonetta.
During the X and Y chapter, X allows Chespin to accompany him. Y later keeps Froakie. The Fennekin is claimed by Malva. This is changed in which Ash gets Froakie, Bayonetta chooses Fennekin as her Starter, and Shauna finds Chespin.
Like with X, Bayonetta is the only main character with a Kanto starter on her.
Serena is a Sky Trainer, just like Y is. Like with Y, her hair gets cut two times.
Suzume would later receive a Chespin of her own, whom she nicknames "Marisso". This is the nickname X gave his Quilladin back when it was a Chespin.