Type Specific Z-Moves:

Electric - Gigavolt Havoc
Fighting -  All-Out Pummeling
Normal - Breakneck Blitz
Fire - Inferno Overdrive
Water - Hydro Vortex
Grass - Bloom Doom
Ice- Subzero Slammer
Flying- Supersonic Strike
Bug - Savage Spin-Out
Poison - Acid Downpour
Dark - Black Hole Eclipse
Dragon - Devastating Drake
Ground - Tectonic Edge
Psychic - Shattered Psyche
Steel - Corkscrew Crash
Ghost - Never-Ending Nightmare
Rock - Continental Crush
Fairy - Twinkle Tackle

Pokemon Specific Z-Moves:

Pulverizing Pancake (Snorlax)
Stoked Sparksurfer (Alolan Raichu)
Catastropika (Pikachu)
10,000,000 Volts Thunderbolt (Ash-Pikachu)
Extreme Evoboost (Eevee)
Guardian of Alola (Tapu Koko/Lele/Bulu/Fini)
Sinister Arrow Raid (Decidueye)
Malicious Moonsault (Incineroar)
Oceanic Operetta (Primarina)
Genesis Supernova (Mew)
Soul-Stealing Seven Star Strike (Marshadow)