In an upcoming NWR interview with Juinichi Masuda that will be releasing later this week, Masuda revealed that Pokémon X and Y will have multiple Pokédex entries corresponding to the language of the game they're from.

While talking about new features in the new games, Masuda said that when players "…trade a Pokémon that comes from a different language in the game [they will] unlock that entry in the Pokédex for that language."

This means collectors will be able to show off not only which Pokémon they have, but which versions of each they've received.