Throughout the entire game, you are given Z-crystals upon completion of your island challenges. When your Pokemon is given a Z-crystal to hold, they’re essentially given a 5th move to their move sets. Your Pokemon can only use a Z-crystal if it has a move of that type in its move set. For example: a Firium Z can be held if the Pokemon knows a Fire-type attack.
There are also 2 ways Z-crystals transform regular moves. There are damage-dealing and non-damage-dealing Z moves–just like normal moves. The power of the Z move also depends on the move that is being turned on by the Z-crystal. The more powerful the base move is, the more powerful the Z move is. Non-damage-dealing Z moves will boost, reset, or restore stats or HP of your Pokemon. A couple moves can also make moves target the user, so bewear (hehe, it’s punny).
Some Z-crystals are Pokemon specific as well as move specific. A Decidium Z can only be held/used by Decidueye. In order to use the Z move Catastropika, Pikachu must be holding a Pikanium Z and know the move Volt Tackle.
With that said, here is the list of Z-crystals and where to find them. Note that there are a few given to you through trade from NPCs in the game, those however are not going to be marked here. These are the main ways to obtain the crystals.
|Z-CRYSTAL||TYPE-SPECIFIC MOVE||HOW TO OBTAIN|
|Aloraichium Z||Stoked Sparksurfer||Receive in from a woman in Seafolk Village|
|Buginium Z||Savage Spin-Out||Pick it up after battling Guzma in the Shady House|
|Darkinium Z||Black Hole Eclipse||Clear Ula’ula Island’s Grand Trial|
|Decidium Z||Sinister Arrow Raid||Receive from Kukui in Malie Garden if you chose Rowlet, or receive from Hau after becoming Champion|
|Dragonium Z||Devastating Drake||Clear the abandoned trial on Poni Island|
|Eevium Z||Extreme Evoboost||Complete the “Eevee Trainers” sub-event after becoming Champion|
|Electrium Z||Gigavolt Havoc||Clear Sophocles’ island trial|
|Fairium Z||Twinkle Tackle||Receive from Mina on Poni Island|
|Fightinium Z||All-Out Pummeling||Clear Melemele Island’s grand trial|
|Firium Z||Inferno Overdrive||Clear Kiawe’s island trial|
|Flyinium Z||Supersonic Skystrike||Find it in Ten Caret Hill|
|Ghostium Z||Never0Ending Nightmare||Clear Acerola’s island trial|
|Grassium Z||Bloom Doom||Clear Mallow’s island trial|
|Groundium Z||Tectonic Rage||Clear Poni Island’s Grand Trial|
|Icium Z||Subzero Slammer||Find it on Mount Lanakila|
|Incinium Z||Malicious Moonsault||Receive it from Kukui in Malie Garden if you chose Litten, or receive from Hau after becoming Champion|
|Normalium Z||Breakneck Blitz||Clear Ilima’s island trial|
|Pikanium Z||Catastropika||Receive from woman in Konikoni City|
|Poisonium Z||Acid Downpour||Receive after battling Plumeria on Poni Island|
|Primarium Z||Oceanic Operetta||Receive if from Kukui in Malie Garden if you chose Popplio, or receive from Hau after becoming Champion|
|Psychium Z||Shattered Psyche||Find it in the Haina Desert|
|Rockium Z||Continental Crush||Clear Akala Island’s grand trial|
|Steelium Z||Corkscrew Crash||Receive from Molayne after clearing Sophocles’ island trial|
|Tapunium Z||Guardian of Alola||Pick it up after becoming Champion and battling Tapu Koko on Melemele Island|
|Waterium Z||Hydro Vortex||Clear Lana’s island trial|