How do I set challenge mode in Black 2?

Question

I have made the key system setting to Challenge mode. Now do I just restart my game and it will be challenge mode?

Answer 1

Turns out once you defeat the game, to play challenge mode, you have to transfer the challenge key to a copy of white2/black2. So basically you need 2 devices and 2 games to play challenge mode.

Comments

I rarely do it, and you will get banned if you keep on doing it

Answer 2

Yes, once you restart, you'll see the homes menu screen containing the unova link option which contains the hard mode.

From serebii:

Once obtained, if you restart your save file, you will lose access to them again.

>They are activated within the Unova Link menu and will run on the save file until deactivated

Comments

So i just start a new game and that screen will pop up?