The Tomodachi Collection: New Life Mii Moving Software was released for the Nintendo 3DS, to transfer Tomodachi Collection Miis over to Tomodachi Collection: New Life game on either cart or digital version. There's not much documented on this software due to its unusual existence. It was released exclusively on the eShop as a tool such as the SD Card Save Data Transfer tool, which in reality it is very similar, moving from cartridge to new game.
Nintendo Description[]
Nintendo has an article on their site,[1] which goes into what it does.
"Tomodachi Collection: New Life Mii Moving Software" is software that moves Mii made with Tomodachi Collection for the DS to the Nintendo 3DS software "Tomodachi Collection: New Life" without having the need to recreate all your Miis from scratch.
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- Up to 100 Miis can be moved. - Relationships, satisfaction levels, clothes, etc. cannot be moved. - Miis and Save Data will not be erased from Tomodachi Collection.