Level of Difficulty
There are different Levels of Difficult in Pokemon Black 2.
Besides Normal Mode, you can change the Level of Difficulty to Assist or Challenge by using the Unova Link.
You Unlock Challenge Mode in Pokemon Black 2 after you have defeated Champion Iris. You can also obtain it by someone sending it to you via the Unova Link.
You can obtain Assist Mode in Pokemon Black 2 by someone sending it to you via the Unova Link.
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