This theory could have worked if her name wasnt Nanase in the japanese version and Naomi in the american version or if she didnt have a name at all , her Pokemon wasnt a Kantonian Sandpan / Sandslash and if she didnt state she's has been to every core series region except Johto, Kalos, and Paldea since she has Serena's japanese voice actress from the anime , Mayuki Makiguchi.