Where did you find the last champion of Pokemon Black and White 2?

Pokemon Black and White 2 found the last champion Alder in the secret base of Alder and Alice. The specific search method is as follows:

1, Pokemon Black and White 2 Alder and Alice's secret base is in a desert cave, and they need a sonic bike to go there;

2. Then, go straight to the top of the electrical engineering department and cross the desert to the entrance of the cave.

Not only Alder and Alice's secret base entered the cave, but also the winner with red hair.