Z-Crystals

Z-Crystals are a type of held item that allow Pokémon to use a Z-Move of the same type. It can be either damaging when a Physical/Special move is used, or a booster for Status moves. Moves, abilities or items like Embargo, Klutz or Trick can't make a Pokémon drop the Z-Crystal that it's holding. There 24 types of Z-Crystals and some are exclusive to certain Pokémon. They can be obtained as Beast Chest loot in Ultra Space, as drops from rare Boss Pokémon or as drops from specific Pokémon. Z-Crystals can also be used to change the type of Arceus.

List of Type Z-Crystals

Item	Effect	Damaging Z-Move
Buginium Z	Converts Bug-type moves into Bug-type Z-Moves	Savage Spin-Out
Darkinium Z	Converts Dark-type moves into Dark-type Z-Moves	Black Hole Eclipse
Dragonium Z	Converts Dragon-type moves into Dragon-type Z-Moves	Devastating Drake
Electrium Z	Converts Electric-type moves into Electric-type Z-Moves	Gigavolt Havoc
Fairium Z	Converts Fairy-type moves into Fairy-type Z-Moves	Twinkle Tackle
Fightinium Z	Converts Fighting-type moves into Fighting-type Z-Moves	All-Out Pummeling
Firium Z	Converts Fire-type moves into Fire-type Z-Moves	Inferno Overdrive
Flyinium Z	Converts Flying-type moves into Flying-type Z-Moves	Supersonic Skystrike
Ghostium Z	Converts Ghost-type moves into Ghost-type Z-Moves	Never-Ending Nightmare
Grassium Z	Converts Grass-type moves into Grass-type Z-Moves	Bloom Doom
Groundium Z	Converts Ground-type moves into Ground-type Z-Moves	Tectonic Rage
Icium Z	Converts Ice-type moves into Ice-type Z-Moves	Subzero Slammer
Normalium Z	Converts Normal-type moves into Normal-type Z-Moves	Breakneck Blitz
Poisonium Z	Converts Poison-type moves into Poison-type Z-Moves	Acid Downpour
Psychium Z	Converts Psychic-type moves into Psychic-type Z-Moves	Shattered Psyche
Rockium Z	Converts Rock-type moves into Rock-type Z-Moves	Continental Crush
Steelium Z	Converts Steel-type moves into Steel-type Z-Moves	Corkscrew Crash
Waterium Z	Converts Water-type moves into Water-type Z-Moves	Hydro Vortex

List of Exclusive Z-Crystals

Item	Effect	Obtaining
Aloraichium Z	Converts Alolan Raichu's Thunderbolt into an exclusive Z-Move	Dropped rarely by wild Raichu
Decidium Z	Converts Decidueye's Spirit Shackle into an exclusive Z-Move	Dropped rarely by wild Decidueye
Eevium Z	Converts Eevee's Last Resort into an exclusive Z-Move	Dropped rarely by wild Eevee
Incinium Z	Converts Incineroar's Darkest Lariat into an exclusive Z-Move	Dropped rarely by wild Incineroar
Kommonium Z	Converts Kommo-o's Clanging Scales into an exclusive Z-Move	Dropped rarely by wild Kommo-o
Lunalium Z	Converts Lunala's Moongeist Beam into an exclusive Z-Move	Dropped by Legendary Boss Pokémon
Lycanium Z	Converts Lycanroc's Stone Edge into an exclusive Z-Move	Dropped rarely by wild Lycanroc
Marshadium Z	Converts Marshadow's Spectral Thief into an exclusive Z-Move	Dropped by Legendary Boss Pokémon
Mewnium Z	Converts Mew's Psychic into an exclusive Z-Move	Dropped by Legendary Boss Pokémon
Mimikium Z	Converts Mimikyu's Play Rough into an exclusive Z-Move	Dropped rarely by wild Mimikyu
Pikanium Z	Converts Pikachu's Volt Tackle into an exclusive Z-Move	Dropped rarely by wild Pikachu
Pikashunium Z	Converts Cap Pikachu's Thunderbolt into an exclusive Z-Move
Primarium Z	Converts Primarina's Sparkling Aria into an exclusive Z-Move	Dropped rarely by wild Primarina
Snorlium Z	Converts Snorlax's Giga Impact into an exclusive Z-Move	Dropped rarely by wild Snorlax
Solganium Z	Converts Solgaleo's Sunsteel Strike into an exclusive Z-Move	Dropped by Legendary Boss Pokémon
Tapunium Z	Converts Tapus' Nature's Madness into an exclusive Z-Move	Dropped by Legendary Boss Pokémon
Ultranecrozium Z	Turns Necrozma fused with Solgaleo or Lunala into a new form	Dropped by Legendary Boss Pokémon