Pokémon producer Juinichi Masuda has confirmed that the Pokédex in the upcoming Pokémon X and Pokémon Y will have multiple language entries.
Fans will be able to exchange Pokémon across the different language versions, granting access to the Pokédex entry for that language when receiving a trade. For example if a trainer using the English version receives a Pikachu from the Japanese edition, it'll unlock the Japanese description as well.
Will you aim to collect other language Pokédex entries?