Black 2/White 2 Key System Workaround?

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I know on the cartridges the only legit way to unlock, for example, the Challenge Key is to beat B2 then send it to another B2 or W2 (and, from there, can send it back). Short of an Action Replay though, is there any other way of unlocking keys?

Are there apps that allow you to just send the keys to your DS through your phone? I just really don't want to have to beat Black 2 first just to be able to play it on Challenge mode from the beginning.

>GF makes difficulty levels for the first time
>fucks it all up by making it available after 90% of the game has been played