In the GBA scene, people didn't actually tend to exploit the carry flag at all. If there was any anti emulation, it was usually flashcart related or cpu timing related.
It was mostly the Game Pak Prefetch feature that was used to foil GBA emulators. A game can detect if the number of cycles to access ROM (with prefetch enabled) is incorrect.
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In the GBA scene, people didn't actually tend to exploit the carry flag at all. If there was any anti emulation, it was usually flashcart related or cpu timing related.
It was mostly the Game Pak Prefetch feature that was used to foil GBA emulators. A game can detect if the number of cycles to access ROM (with prefetch enabled) is incorrect.