TheDarkinium Z (Japanese:アクZEvil Z) is a type ofZ-Crystal introduced inPokémon Sun and Moon. It is thetype-specific Z-Crystal associated with theDark type and allows Pokémon to upgrade their Dark-type moves toZ-Moves.
Nanu used a Darkinium Z inGuiding an Awakening! to have hisAlolanPersian perform Black Hole Eclipse during hisgrand trial battle againstAsh. After Ash defeated Nanu, Nanu contemplated giving Ash a Darkinium Z as a prize, but then quickly decided to give him aLycanium Z instead.
A full set oftype-specific Z-Crystals, including the Darkinium Z, appeared inA Grand Debut!, whereHapu allowed Ash to choose his grand trial prize from them.
A full set of replicas of the type-specific Z-Crystals, including the Darkinium Z, also appeared inA Team-on-Team Tussle!, where they were shown to Ash andhis classmates byProfessor Kukui.