Unlike earlier Gen 4 titles, Pokémon Black 2 is a game. It contains standard Nintendo DS data alongside specialized code—known as DSi binaries —that instructs DSi and 3DS hardware to unlock upgraded features.
In the early days of ROM hoarding, users would "trim" games to remove empty data and save SD card space. Because the DSi binaries reside in what looks like the filler partition of a cartridge dump, legacy trimming tools wiped them right out. How to Get Your Pokémon Black 2 DSi Binaries Fixed
The upgraded CPU speed of the DSi and 3DS reduces micro-stutters, drastically shortening the loading delay when opening and sorting heavy PC boxes in the Pokémon Center.
If your game file lack these fixed binaries, the console defaults to regular DS mode, locking you out of several core features:
Extract the game to your SD card. Modern builds of GodMode9 preserve all encrypted DSi binary partitions without issue. 2. Source an Unmodified "No-Intro" File