GBA emulation has been solved for 20 years. It runs on a toaster. DS emulation, while good now, still requires more CPU power and managing two windows (or a cluttered layout on a phone).


If you ignore the warnings and download a file labeled Pokemon_HeartGold_GBA.gba, what will you actually get? The answer falls into three categories, ranging from disappointing to fantastic.

Since you are already willing to emulate, simply emulate the correct hardware. You need a Nintendo DS emulator, not a GBA one.