This specific file— Pokemon Brilliant Diamond -NSP--Update 1.3.0-.rar —is a pirated copy of the game provided in a format designed for use on modified Nintendo Switch consoles or emulators.
Beyond content, 1.3.0 addressed several "out of bounds" glitches and soft-lock bugs that plagued the initial 1.0 release. Understanding the .NSP and .RAR Format
This version laid the groundwork for the Member Card event, allowing players to access Newmoon Island to catch the mythical Darkrai.
: Archive files from third-party sites can sometimes contain malicious scripts.
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To run version 1.3.0 successfully, ensure your and Firmware are up to date. Since this update was released later in the Switch's lifecycle, using outdated 2021 keys may cause the game to fail to boot or show a black screen.