Z-Rings and Z-Crystals? They're these! [Ash held up his wrist and there was a black ring with a yellow diamond embedded into it] This is a Z-Ring and a Z-Crystal. The ones Hala makes are white but the Tapus turned mine into a black one to fit the unique crystals which look like this.

[He held up a Lycanium-Z which was Diamond-shaped with two little prongs on either end.]

They plug into the band and you use them in battle. But to use them is a lot of Z-Energy, and when you start out, it costs a lot of Z-Energy. Most trainers are only able to use one starting out, and a lot of them fail their first try! Pikachu!

Pika?

Let's show Sena a Z-Move! You don't mind, right? We'll demonstrate on that rock there. [Ash pointed to the rocky outcropping on the beach a few yards away.]