What major release distinction did Pokémon X and Y achieve in 2013?

Pokémon X and Y achieved the first simultaneous worldwide release in the main Pokémon game series.

The games launched on October 12, 2013, for Nintendo 3DS systems around the world. Earlier Pokémon games had reached different territories at different times, so the global launch represented a major change in how the franchise coordinated releases.

Pokémon X and Y were the first sixth-generation games. They introduced the Kalos region, 72 new Pokémon species, the Fairy type, Mega Evolution, character customization, and fully polygonal 3D graphics in the core series.

The games are separate versions with version-exclusive content, but both follow the same broad adventure. Their worldwide launch helped make announcements, fan discussion, and competitive play feel more unified across regions.