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>gba emulator from app store, ex. johngba or some shit
>download prepatched .gba/ zip or apply a patch to a .gba you download from internet
>locate .gba with your emulator
alternatively you can use GBA Injector to play on 3DS, but romhacks that mess with the save type (like Clover) can be unplayable
>ds
i put the .nds on a flashcart
>3ds
install .cia with FBI