X Update 15 3ds World Cia Region F Better: Pokemon
You need the base game CIA (usually labeled something like Pokemon_X_World.cia or simply Pokemon_X.cia ). You cannot use the "Update 1.5" file without this.
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Pokémon X and Y were the first games in the series to feature a simultaneous global release. Because the internal data is largely the same across regions, many update files are designed to be "Region Free" or "World" compatible, meaning they can be applied to North American (USA), European (EUR), or Japanese (JPN) copies of the game. You need the base game CIA (usually labeled