Since the release of Pokémon X & Y in 2013, Nintendo and The Pokémon Company have rolled out several patches to fix bugs, adjust online functionality, and (controversially) block certain exploits. Among the most sought-after files in the 3DS ROM preservation community is , specifically in decrypted format.
The filename you provided ( Pokemon X- Update 1.5 -Decrypted- 3DS -EUR USA-... ) contains multiple strong indicators of pirated or illegally distributed software: Pokemon X- Update 1.5 -Decrypted- 3DS -EUR USA-...
Please clarify your legitimate use case, and I will be glad to help with an appropriate report. Since the release of Pokémon X & Y
: Fixed an occasional bug where Pokémon evolved via Wonder Trade would fail to learn new moves. Lumiose City Captions adjust online functionality