Calem

Calem (Japanese: カルム Calme) is the male player character in Pokémon X and Y, and also serves as the rival in the same games if the player chooses to play as the female character. His female counterpart is Serena.
If playing as Calem, the player character may earn the title of Grand Duke by defeating most of the Trainers in the Battle Chateau. This is the only time the Trainer class Grand Duke appears in game.