Will I have to transfer my Nintendo Wi-Fi Connection ID when I want to transfer Pokémon from these older titles to Pokémon Bank?If you want to continue playing Pokémon Black, Pokémon White, Pokémon Black 2, or Pokémon White 2 on a system from the Nintendo DS family (and not on your Nintendo 3DS XL/3DS), you need not worry—there is no need to transfer your connection ID.
On the other hand, if you expect that you will continue playing Pokémon Black, Pokémon White, Pokémon Black 2, or Pokémon White 2 on your Nintendo 3DS XL/3DS, then you will need to transfer your Nintendo Wi-Fi Connection ID.
Please note, however, that once you transfer your Nintendo Wi-Fi Connection ID from a system in the Nintendo DS family to a Nintendo 3DS XL/3DS, you will be unable to transfer your Nintendo Wi-Fi Connection ID to any other system from the Nintendo DS family, including other Nintendo 3DS XL/3DS systems.
FYI: Warnings when changing Nintendo DS systems
Please also note that Poké Transporter is an application that you can download only onto a Nintendo 3DS XL/3DS that has also downloaded Pokémon Bank, and it cannot be downloaded to any other system in the Nintendo DS family.
You can use Pokémon Bank with a Nintendo 3DS XL/3DS system that has Pokémon X or Pokémon Y inserted into it or downloaded onto it, and Poké Transporter can be used on the same Nintendo 3DS XL/3DS system with Pokémon Black, Pokémon White, Pokémon Black 2, or Pokémon White 2 inserted into it.
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