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How does the key system work in BW2? I have access to two DS consoles so I thought of finally trying the challenge mode in Black 2. However, I'm not entirely sure how to unlock the challenge mode there. I know that after beating B2 you unlock the key, not the challenge mode, and you have to send the key to another game to unlock the actual challenge mode. My question basically is that can I send the key to W2 and then back to B2 to unlock the challenge mode there, or do I have to receive the key directly from another B2?
This key system is the single most retarded thing GF has ever done. What the actual fuck? Why can't I just start a challenge mode after beating E4 in B2?
