Things only get truly challenging near the end of the story missions, when the game throws trainers and gym leaders at you that take some careful planning to defeat. Pokemon's postgame content is actually some of the best it has to offer, with new areas opening up and even more challenges appearing, significantly extending the life of the game past the 30 hours a straight run of the main campaign takes. Pokemon X/Y also has several multiplayer features, including a variety of battle modes, a global trading system for captured pokemon, and ways to support your friends through the awarding of temporary boosts. It's a comprehensive online offering, and it makes you feel more connected than ever before to other pokefans for battling or trading.
This is what gamespot says about X and Y.Other reviewers say post game content is sparse. In my opinion i think they just havent unlocked all the post game content yet. If one of the requirements is finishing the local dex like in sinnoh im going to flip out!