I went straight to Kiloude city after beating the elite 4 to battle Serena but she wasn't their is there something I need to do to get her their because I need her upgrade my Mega ring.
Have you won a battle in the Battle Maison yet? That's a requirement to meet Serena/Calem in Kiloude City I think. If so, Serena should be at the top of the city at the place with the benches and pond.
