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.
A full set of type-specific Z-Crystals, including the Fightinium Z, appeared in A Grand Debut!, where Hapu allowed Ash to choose his grand trial prize from them.
A Fightinium Z appeared in SM114, where Hala was shown placing one in a newly constructed Z-Ring. It was soon after stolen by a Pheromosa.