Ash, Professor Kukui and others in “To Top a Totem!”

I remember that you can earn Z-crystals by going through an Island Challenge. Isn't that right?

It isn't the only way. But going through the Island Challenge is the most certain way. The key to your success is to pass the Grand Trial of each of the Island's Kahunas.

[finishing his milk] So, how do you do that?

I will answer that with great pleasure. A Grand Trial is a battle between trainer and Island Kahuna. If the trainer wins, the Kahuna acknowledges that trainer's worthiness.

Whoa, sounds like fun. [Be careful, Ash. They are not like the Gym Leaders you have fought in the past.]