Pokémon Black 2 and the DSi Enhancement Binaries: A Technical Deep Dive

When Pokémon Black 2 and White 2 launched in 2012 for the Nintendo DS, they arrived at a unique crossroads in Nintendo’s handheld history. The Nintendo DSi had been on the market for four years, boasting slightly improved hardware, more RAM, and—crucially—a DSi-only digital storefront (DSiWare) and the ability to execute DSi-enhanced code. Game Freak leveraged these capabilities in Black 2/White 2 through a set of files known colloquially as DSi Binaries (or DSi-Enhanced Binaries).

Understanding Pokémon Black 2 DSi Binaries Pokémon Black 2 and White 2 are among a select group of "DSi-enhanced" titles that bridge the gap between the original Nintendo DS and the DSi hardware. The DSi binaries are specific portions of the game's code designed to utilize the improved capabilities of the Nintendo DSi and 3DS systems. What Are DSi Binaries?

Enter MelonDS – The Game Changer

The open-source emulator MelonDS is the first emulator to fully support DSi mode. When you run Pokémon Black 2 in MelonDS with the “Boot DSi Mode” option enabled, the emulator loads the DSi BIOS and firmware, then executes the DSi binaries inside the ROM.

Hidden IR Pointer Table
In the DSi binary, there is a table of functions that maps to DSi’s built-in IR port (normally used for DSiWare transfers). Pokémon Black 2 never publicly advertised IR, but dataminers found: