Even with the "best" World CIA, you might hit errors. Here is the fix:
Update 1.5 addresses core stability issues and gameplay bugs present in earlier revisions of Pokémon X . pokemon x update 15 3ds world cia region f best
Yes, version 1.5 is the final official update released by Nintendo for Pokémon X and Y. Even with the "best" World CIA, you might hit errors
: Mandates version 1.5 to access the Player Search System (PSS), Wonder Trade, and the Global Trade Station (GTS). Even with the "best" World CIA