Amid the dull hues of the kingdom sits a relatively normal building, blending into the rather monochromic scenery quite well. It's a somewhat large house with few defining features... well, save for the many painfully bright varieties of color splattered all over it in seemingly random splashes. That, and the big, equally colorful sign built over the roof, reading "BLACKTOOTH Z-REFINERY!" Aside from that, though, it's a perfectly normal and unenchanting structure, matching its surroundings perfectly. Its dull-colored, depressing surroundings. Yep.
The internal design of the refinery is about what you'd expect after seeing the outside. In other words, it has an appearance that would suggest there was an accident with a large child eating a crate of crayons before falling ill and painting the walls, so to speak. In the center of the entrance room is a table surrounded not by chairs, but large, fluffy pillows. This is where most business discussion takes place, and customers are expected, though not required, to sit and chat. Firseir, the owner, may or may not be asleep on one of the cushions at any given time; he gets bored when there are no customers. There are three windows spread between the walls to the left, right and back, letting in all the light they can. Near the back of the room is a spiral staircase leading both up and down, leading to the roof and and basement, respectively.
The roof is flat, more like a wood floor, with rails a few feet high surrounding it to help prevent customers from accidentally falling. There definitely wasn't an incident that prompted this safety precaution. The roof area is mostly to give customers a nice place to practice with their new crystals, and as such, there are a few ring-patterned circular targets laying around that can be propped up and used for practice. Down below is pretty much a cave, and it's where the magic happens. Firseir will bring the appropriate materials down here for some workers to "refine," as he calls it, and after a while he'll come back up with the finished product. The process is actually quite interesting and boring and surely no one would want to know how it's done.
Most Z-Crystals can be used by any pokémon to empower a move of one type, but there are some that resonate only with specific species. Some kind of stone or something of the sort that can be refined into a Z-Crystal is required in order to craft one. Firseir, the zorua running the place, has taken the liberty of labeling all the crystals and the corresponding "Z-moves" they create, though his names may not always be fitting. The instructions for use of a Z-Crystal are simple: concentrate much like with a mega stone, then do a little dance to activate your new superpower! Careful, though, as they are quite exhausting.
Disclaimer: you don't have to dance, but Firseir says it makes it more fun.
Here, all available Z-Crystals are listed, along with the names of their corresponding attacks and crafting options. A "mysterious stone" can be used to make any crystal, but if you don't have one of those, you can use something else listed next to your desired crystal. Say which one(s) you want and what you're trading and paying! (Z-Crystals are very tasking to use, and so only one Z-move can be performed per thread. Like mega stones, they bind to one character and cannot be used by anyone else.)
Type-specific crystals (cost: 500 poké)
Buginium Z - Savage Spin-Out (Leaf Stone/Moss Rock)
Darkinium Z - Black Hole Eclipse (Dusk Stone)
Dragonium Z - Devastating Drake (Rare Fossil)
Electrium Z - Gigavolt Havoc (Thunder Stone)
Fairium Z - Twinkle Tackle (Moon Stone/Shiny Stone)
Fightinium Z - All-Out Pummeling (Dawn Stone)
Firium Z - Inferno Overdrive (Fire Stone/Flame Orb/Heat Rock)
Flyinium Z - Supersonic Skystrike (Dawn Stone)
Ghostium Z - Never-Ending Nightmare (Dusk Stone)
Grassium Z - Bloom Doom (Leaf Stone/Moss Rock/Sun Stone)
Groundium Z - Tectonic Rage (Rare Fossil/Smooth Rock)
Icium Z - Subzero Slammer (Ice Stone/Ice Rock/Icy Rock)
Normalium Z - Breakneck Blitz (Everstone)
Poisonium Z - Acid Downpour (Toxic Orb)
Psychium Z - Shattered Psyche (Dawn Stone)
Rockium Z - Continental Crush (Rare Fossil/Smooth Rock)
Steelium Z - Corkscrew Crash (Metal coat)
Waterium Z - Hydro Vortex (Water Stone/Damp Rock)
You can also use a type-corresponding gem to make these, ie: Icy Gem, Sky Gem, etc.
Pokemon-specific crystals (cost: 750 poké)
These can ONLY be formed from a Mysterious Stone and can be used by any pokémon in the evolutionary line. If the pokémon is lower than the intended stage of evolution, then the power of the Z-Move is weakened. Being a higher stage does nothing to affect it.
Pikanium Z - Catastropika (Pikachu)
Pikashunium Z - 10,000,000 Volt Thunderbolt (Pikachu)
Aloraichium Z - Stoked Sparksurfer (Alolan Raichu ONLY)
Eevium Z - Extreme Evoboost (Eevee)
Snorlium Z - Pulverizing Pancake (Snorlax)
Decidium Z - Sinister Arrow Raid (Decidueye)
Incinium Z - Malicious Moonsault (Incineroar)
Primarium Z - Oceanic Operetta (Primarina)
Kommonium Z - Clangorous Soulblaze (Kommo-o)
Lycanium Z - Splintered Stormshards (Lycanroc)
Mimikium Z - Let's Snuggle F͜͠͠o͏̸͝r̢͟͢͝҉e̸͝v̷̡͢e̛͠͞͝r̡̀̕͟͠ (Mimikyu)
If you don't have the items you need, maybe Firseir does! Check down here for the current stock of crafting items! They're 100 poké a piece unless stated otherwise.
Everstone x2, Moss Rock, Rare Fossil, Thunderstone, Toxic Orb x2.