Another New concept of attacking in the Seventh Generation is tthat of Z-Moves. Z-Moves are especially strong Attacks, useable with the harnessed power of Z-Crystal and a Z-Ring. Each Z-Crystal is a given type - a player will obtain and find all of them throughout the game - and it provides a Z-Move for the same given type of move if said Pokemon has that typ of move and is holding its corresponding Z-Crystal. Some Z-Moves and Z-Crystal are exclusive to one given Pokemon.
Z-Moves aren't usually set as whether or not they are a Physical or Special Attack, as well as not having a set Base Power. Instead, damage is calculated on the Base Move that is used. One example of this is Gigavolt Havoc: if used off the base move of Nuzzle, it will be a Physical Attack (like Nuzzle) with a strength of only 100; if used off the base move of Thunderbolt, it will be a Special Attack (like Thunderbolt) with a base power now of 175.
But there are a few restrictions to Z-Moves, much like Mega Evolutions. To start, only one Z-Move can be used by only one Pokemon per Battle. Said Pokemon, aforementioned, must also know a move of the same given type of Z-Crystal (you can't use Grassium Z on a Water Type Attack). Z-Moves also break through the move Protect, but at the cost of 25% of the Max Damage of such.
There Are A Grand Total of 29 Specific Z-Moves:
10,000,000 Volt Thunderbolt
Typing: Electric
Category: Special Only
Z-Crystal Required: Pikashunium Z
Exclusive: Event-Only Pikachu Wearing A Cap
Description: The user, Pikachu wearing a cap, powers up a jolt of electricity using its Z-Power and unleashes it. Critical hits land more easily.
Acid Downpour
Typing: Poison
Category: Physical OR Special
Z-Crystal Required: Poisonium Z
Description: The user creates a poisonous swamp using its Z-Power and sinks the target into it at full force. The power varies, depending on the original move.
All-Out Pummeling
Typing: Fighting
Category: Physical OR Special
Z-Crystal Required: Fightinium Z
Description: The user rams an energy orb created by its Z-Power into the target with full force. The power varies, depending on the original move.
Black Hole Eclipse
Typing: Dark
Category: Physical OR Special
Z-Crystal Required: Darkinium Z
Description: The user gathers dark energy using its Z-Power and sucks the target into it. The power varies, depending on the original move.
Bloom Doom
Typing: Grass
Category: Physical OR Special
Z-Crystal Required: Grassium Z
Description: The user collects energy from plants using its Z-Power and Attacks the target with full force. The power varies, depending on the original move.
Breakneck Blitz
Typing: Normal
Category: Physical OR Special
Z-Crystal Required: Normalium Z
Description: The user builds up its momentum using its Z-Power and crashes into the target at full Speed. The power varies, depending on the original move.
Catastropika
Typing: Electric
Category: Physical Only
Z-Crystal Required: Pikanium Z
Exclusive: Pikachu
Description: The user, Pikachu, surrounds itself with the maximum amount of electricity using its Z-Power and pounces on its target with full force.
Continental Crush
Typing: Rock
Category: Physical OR Special
Z-Crystal Required: Rockium Z
Description: The user summons a huge rock mountain using its Z-Power and drops it onto the target with full force. The power varies, depending on the original move.
Corkscrew Crash
Typing: Steel
Category: Physical OR Special
Z-Crystal Required: Steelium Z
Description: The user spins very fast and rams into the target with the full force of its Z-Power. The power varies, depending on the original move.
Devastating Drake
Typing: Dragon
Category: Physical OR Special
Z-Crystal Required: Dragonium Z
Description: The user materializes its aura using its Z-Power and Attacks the target with full force. The power varies, depending on the original move.
Extreme Evoboost
Typing: Normal
Category: Status
Z-Crystal Required: Eevium Z
Exclusive: Eevee
Description: After obtaining Z-Power, the user, Eevee, gets energy from its evolved friends and boosts its Stats sharply.
Genesis Supernova
Typing: Psychic
Category: Special Only
Z-Crystal Required: Menium Z
Exclusive: Mew
Description: After obtaining Z-Power, the user, Mew, Attacks the target with full force. The terrain will be charged with psychic energy.
Gigavolt Havoc
Typing: Electric
Category: Physical OR Special
Z-Crystal Required: Electrium Z
Description: The user hits the target with a powerful electric current collected by its Z-Power. The power varies, depending on the original move.
Guardian of Alola
Typing: Fairy
Category: Special
Z-Crystal Required: Tapunium Z
Exclusive: Tapu Koko, Tapu Lele, Tapu Bulu, Tapu Fini
Description: The user, the Land Spirit Pokemon, obtains Alola's energy using its Z-Power and Attacks the target with full force. This reduces the target's HP greatly.
Hydro Vortex
Typing: Water
Category: Physical OR Special
Z-Crystal Required: Waterium Z
Description: The user creates a huge whirling current using its Z-Power to swallow the target with full force. The power varies, depending on the original move.
Inferno Overdrive
Typing: Fire
Category: Physical OR Special
Z-Crystal Required: Firium Z
Description: The user breathes a stream of intense fire toward the target with the full force of its Z-Power. The power varies depending on the original move.
Malicious Moonsault
Typing: Dark
Category: Physical Only
Z-Crystal Required: Incinium Z
Exclusive: Incineroar
Description: The user, Incineroar, strengthens its Body using its Z-Power and crashes into the target with full force.
Never Ending Nightmare
Typing: Ghost
Category: Physical OR Special
Z-Crystal Required: Ghostium Z
Description: Deep-seated grudges summoned by the user's Z-Power trap the target. The power varies, depending on the original move.
Oceanic Operetta
Typing: Water
Category: Special Only
Z-Crystal Required: Primarium Z
Description: The user, Primarina, summons a massive amount of Water using its Z-Power and Attacks the target with full force.
Pulverizing Pancake
Typing: Normal
Category: Physical Only
Z-Crystal Required: Snorlium Z
Description: Z-Power brings out the true capabilities of the user, Snorlax. The Pokemon Moves its enormous Body energetically and Attacks the target with full force.
Savage Spin Out
Typing: Bug
Category: Physical OR Special
Z-Crystal Required: Buginium Z
Description: The user binds the target with full force with threads of silk that the user spits using its Z-Power. The power varies, depending on the original move.
Shattered Psyche
Typing: Psychic
Category: Physical OR Special
Z-Crystal Required: Psychium Z
Description: The user controls the target with its Z-Power and hurts the target with full force. The power varies, depending on the original move.
Sinister Arrow Raid
Typing: Ghost
Category: Physical Only
Z-Crystal Required: Decidium Z
Exclusive: Decidueye
Description: The user, Decidueye, creates countless arrows using its Z-Power and shoots the target with full force.
Soul Stealing 7-Star Strike
Typing: Ghost
Category: Physical Only
Z-Crystal Required: Marshadium Z
Exclusive: Marshadow
Description: After obtaining Z-Power, the user, Marshadow, punches and kicks the target consecutively with full force.
Stoked Sparksurfer
Typing: Electric
Category: Special Only
Z-Crystal Required: Aloraichium Z
Exclusive: Alolan Raichu
Description: After obtaining Z-Power, the user, Alolan Raichu, Attacks the target with full force. This move leaves the target with paralysis.
Subzero Slammer
Typing: Ice
Category: Physical OR Special
Z-Crystal Required: Icium Z
Description: The user dramatically drops the temperature using its Z-Power and freezes the target with full force. The power varies, depending on the original move.
Supersonic Skystrike
Typing: Flying
Category: Physical OR Special
Z-Crystal Required: Flyinium Z
Description: The user soars up with its Z-Power and plummets toward the target at full Speed. The power varies, depending on the original move.
Tectonic Rage
Typing: Ground
Category: Physical OR Special
Z-Crystal Required: Groundium Z
Description: The user burrows deep into the ground and slams into the target with the full force of its Z-Power. The power varies, depending on the original move.
Twinkle Tackle
Typing: Fairy
Category: Physical OR Special
Z-Crystal Required: Fairium Z
Description: The user creates a very charming space using its Z-Power and totally toys with the target. The power varies, depending on the original move.