The Fightinium Z (Japanese: カクトウZFighting Z) is a type of Z-Crystal introduced in Pokémon Sun and Moon. It is the type-specific Z-Crystal associated with the Fighting type, and allows Pokémon to upgrade their Fighting-type moves to Z-Moves.
Unaffected by item negating effects (such as Embargo and Klutz). Item manipulating effects (such as Trick and Fling) cannot remove a Z-Crystal from a Pokémon.
In Trial and Tribulation!, Hala used a Fightinium Z with his Hariyama in his grand trial challenge with Ash. Later in the episode, Tapu Koko swapped the Fightinium Z Ash was supposed to receive as a reward for completing his Melemele grand trial with an Electrium Z.