It was originally added in HeartGold and SoulSilver as a hidden title screen function that is activated by pressing the X, Y, and ↓ buttons simultaneously. In the Generation V games, it is an entry in the main menu.
A Mic Test function was later included in the settings of the DSi and the 3DS system software, so this feature became unnecessary and was removed in post-Generation V games. As HeartGold, SoulSilver, and the Generation V games are DS titles, the inclusion of the Mic Test provided players using the older DS models with the ability to test their microphone.
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Reason: 3DS Mic Test.
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