Pokémon Black 2 (and White 2) are . This means the ROM file (the digital copy of the game) actually contains two sets of code:
The DSi’s CPU runs at 133 MHz (compared to the DS’s 67 MHz), leading to faster menu loading in the Pokédex and Bag. Pokemon Black 2 Dsi Binaries
But it wasn't the Pokémon Black 2 he knew. Pokémon Black 2 (and White 2) are
: The DSi binaries are not a separate game or a patch. They are the same ROM’s secret second gear, unlocked only when the cartridge senses it is in a more powerful handheld—a quiet testament to forward-thinking (if niche) console optimization. Pokemon Black 2 Dsi Binaries