Pokemon X and Y: Confusion Labyrinth

Three years ago, five kids were given their PokeDexes from Kalos. Time skip 1 year, two disappeared. Time skip another, three more set out with the mission to find Serena and Calem. But the problem is, Team Flare is up and running again, and the three cannot stand each other at all. Kalos is in their hands... But they have the chance to throw it away. (SerenaXCalem at the end)