Play the game in crisp 4K resolution instead of the original 240p screen limitation.

: Enhanced detection of cheat devices and unauthorized data manipulation during competitive play. If a player attempting to manipulate data is encountered in a Random Matchup, the match now ends immediately without affecting either player's rating. Evolution Glitch

The presence of both "EUR" and "USA" in the title refers to the regions the update is compatible with. This is where the 3DS's infamous comes into play. While the 3DS console itself is heavily region-locked, the situation for Pokémon X and Y is unique.