If Serena use to live in Kanto, Pallet Town and was one of Ash's friends by the looks of it, then why'd she and her mum move to Kalos? I find it kinda sad, sort of like a love story, of course if anything, it'll go "I'm so happy to see you again" without any question of why they moved. But who knows?
I always knew the writers would run out of ideas eventually, now they're relying on a love story, they'll give the anime or at least XY series, a new genre; Drama/Romance. Jk.
K, also did anyone else notice after the intro scene with Serena, the sea and the plane or was it after the opening, whenever it was... When Ash came out of the plane shouting out, the first 2 Pokemon he sees are two Spritzee flying up in the sky, dancing, almost as if they were in love?
I think they're actually going to bring in some sort or canon love for Ash (like a love interest with Serena), call it a stretch but they may, she's already likely childhood friends, has a crush, in a France/Paris based region and city.