Nintendo confirms Pokemon X and Y will have more ways to level up, some of the new ways introduced such as:
- In Pokémon X and Pokémon Y, your Pokémon gain experience even when the opposing wild Pokémon is caught, according to a summary of the interview on Bulbagarden. Caught Pokémon will give the same amount of EXP as defeated Pokémon.
- the item Exp. Share will provide experience to all Pokémon in the party, not just the one that participated in battle. The participating Pokémon will receive 100% of the total EXP, while non-participating Pokémon will receive 50% each.
Read more at http://www.siliconera.com/2013/09/25/pokemon-x-pokemon-y-make-levelling-easier/#1pmZzphmOe2Lq67C.99
Some pretty good stuff, game gets better everyday :D