A Z-Crystal is an item required to upgrade moves to Z-Moves. During the game, the player can obtain Z-Crystals for their Bag, which will be stored in a dedicated Bag section. These Z-Crystals can be used to create held items of the same name at will. A held Z-Crystal is automatically removed if the Pokémon is traded between players; however, some Pokémon received from in-game trades may be holding a Z-Crystal the player already has. Read more about Z-Crystals and Z-Moves
In Guzma's room in the Shady House in Po Town (Ula'ula Island), in the chest next to the chair.
From Kahuna Nanu after defeating him in his grand trial in Malie City (Ula'ula Island).
Reward for defeating Totem Kommo-o in Vast Poni Canyon (Poni Island).
From Captain Sophocles after completing his trial in the Hokulani Observatory (Ula'ula Island).
From Mina on the bridge in Vast Poni Canyon (Poni Island)
From Kahuna Hala after defeating him in his grand trial in Iki Town (Melemele Island).
From Captain Kiawe after completing his trial in Wela Volcano Park (Akala Island).
In Ten Carat Hill (Melemele Island), on a cliff overlooking the hollow, via the path blocked by a heavy boulder in the cave (requires Machamp Shove).
From Captain Acerola after completing her trial in the Abandonded Thrifty Megamart (Ula'ula Island).
From Captain Mallow after completing her trial in Lush Jungle (Akala Island).
From Kahuna Hapu after defeating her in her grand trial in Vast Poni Canyon (Poni Island).
In the cave of Mount Lanakila (Ula'ula Island), on a pedestal in the right side of the cave, reached by bearing right at every branch in the path from the initial entrance.
From Captain Ilima after completing his trial in Verdant Cavern (Melemele Island).
From Plumeria on Ancient Poni Path (Poni Island), after defeating the Team Skull Grunts.
In Haina Desert, on the pedestal at the end of the path reached by following the stone stacks in order, 2-1-4-3 (after completing Acerola's trial).
From Kahuna Olivia after defeating her in her grand trial in the Ruins of Life (Akala Island).
From Molayne after completing Sophocles' trial in the Hokulani Observatory (Ula'ula Island).
From Captain Lana after completing her trial in Brooklet Hill (Akala Island).
From the lady with three Pikachu in Konikoni City (Akala Island).
In Seafolk Village (Poni Island), from the female Veteran inside the Steelix ship in the east for showing her an Alolan Raichu.
From Kagetora at the leftmost counter in the Thrifty Megamart on Royal Avenue (Akala Island) after completing his challenge.
Held by the Snorlium Z Munchlax (event).
If the player chose Rowlet as their starter: In Malie Garden (Ula'ula Island), from Professor Kukui after defeating Guzma.
If the player didn't choose Rowlet: In the player's house (Melemele Island), from Hau after becoming Champion.
If the player chose Litten as their starter: In Malie Garden (Ula'ula Island), from Professor Kukui after defeating Guzma.
If the player didn't choose Litten: In the player's house (Melemele Island), from Hau after becoming Champion.
If the player chose Popplio as their starter: In Malie Garden (Ula'ula Island), from Professor Kukui after defeating Guzma.
If the player didn't choose Popplio: In the player's house (Melemele Island), from Hau after becoming Champion.
Obtained after battling Tapu Koko in the Ruins of Conflict (Melemele Island).