What is the most powerful Z-Crystal?

ThePanchamBro

Can anybody think? You may use your opinions! For me if there was an “Arceum Z”, it would be crazy!

Voltareon2012

Either Ultranecroznium or Pikanium because that sounds like something Nintendo would do.

Eckxile

100% My boy, Excadrill. His mega is rocking.

ThePanchamBro

https://community.pokemon.com/en-us/discussion/comment/100762#Comment_100762

Maybe

Michael629303

Technical the fire z crystal if its used with the move V-create but thats only with Victini, otherwise I think Ultra Necrozma z crystal.