We’ve seen what the legendary Pokemon for Pokemon X and Y will be, however despite seeing them in the debut trailer, their names were never given. That changed today when it was revealed that the Legendary Pokemon shown above is called Xerneas, which is pronounced ZURR-nee-us according to the statement.
As for the other Pokemon found right above here, it is called Yveltal, which should be pronounced as ee-VELL-tawl. Currently it hasn’t been announced which legendary will be in which game, though obviously they will either be assigned by their initial, or flipped to throw fans for a loop. Pokemon X and Y are currently set to be released worldwide sometime in October 2013.