How do I use codes in black 2?

Question

there codes (u.s. codes) that have numbers but how do I use them?

Answer 1

Technically you cant use these codes without Action Replay. Action Replay is an Add on that uses codes to generate your own entities. Say you want a Victini, you need the code then activate it. This Add On is for every console EXCEPT for Xbox 360, PS3, and Wii U. The 3DS and DSi count as a console since they can hold much more data than a regular DS. They can normally be found at target. BUT it is a separate game card that holds tons of games. Long story short, they can only be used for the Action Replay. Hope that helped.

Answer 2

These are probably Action Replay codes. You will have to buy Action Replay to make them do anything.