Levia

So the other day I was wondering, "Are there Z-Moves for Essentials?". Seems like there are. So I tried it out and it is a great system. But it's too complicated for my feeble beginner mind to handle. So could you please reply and tell me how to make a custom Z-Move for my Whiscash. I'd love to know. So please reply so I can test it out. I've come pretty far as to actually having the item in-game, but if I give my Whiscash the Whiscashium-Z, the little Z-move box doesn't appear on the battle screen. I have the right move on him (Waterfall) but it still doesn't work. Please reply if you can.