Deviant Art by endless-whispers

"So....AnimeKid2 has become Animekiller.... um Ok...."

Porygon-Z

Type:
Base Stats: 85 HP / 80 Attack / 70 Defense /  135 Special Attack / 75 Special Defense / 90 Speed
Weaknesses:   x2
Resistances: None
Immunities: x0

Ability 1: Adaptability - STAB Moves receive a x2 multiplier instead of usual x1.5. 
Ability 2: Download - Raises either the Attack or Special Attack stat depending on the opponent's lowest defensive stat. During Double Battles, the stat raise is determine by added the two opposing Pokemon's defensive stats and determines which offensive stat will rise. If both Defense and Special Defense are equal, the user's Special Attack is raised. 
Hidden Ability (unreleased): Analytic - Receives a 30% boost if the user goes last in battle turn. 
 

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Porygon-Z @ Normalium Z
Ability: Adaptability
Level: 50
EVs: 20 HP / 28 Def / 252 SpA / 4 SpD / 204 Spe
Modest Nature
IVs: 0 Atk
- Thunderbolt
- Ice Beam / Shadow Ball / Recover
- Conversion
- Protect

Milestones:
- Important: "Select" which type Porygon-Z becomes based on Z-Conversion. Will only cover Electric (Thunderbolt) at this time. 
- Outspeeds Neutral Max Speed Pheromosa and Modest Scarf Xurkitree by one point.
-Can take one regular EQ from Garchomp with boosts.

Here is one of Porygon-Z's "many" Z-Conversion setup sets where it changes to Electric-type with Thunderbolt being its first moveslot. If Porygon-Z manages to gets its Z-Conversion with proper support, this thing can do some major damage against the opponent, especially consider the amount of "multipliers" and boosts it receives from a changes STAB, Adaptability, a +1 Special Attack increase (not to mention other stats), and of course potential "Electric Terrain". The damage output from an Electric-type boosted Porygon-Z is quite insane given how high this duck's special attack stat is. To get an idea of how strong this setup is, look at this: 

Yeah... that's gonna hurt. Basically speaking, a "boosted" Thunderbolt can essentially OHKO or 2HKO almost the entire format provide the opponent doesn't have ways to negate the damage.  For coverage options, it depends on what type of Pokemon Porygon-Z has to fear. If Porygon-Z fears the likely Ground-, Grass-, or Dragon-type Pokemon, then Ice Beam is a safe options as changes are a +1 boosted Ice Beam attack can ensure the OHKO. Shadow Ball is listed to hit opposing Ghost- and Psychic-type Pokemon such as Tapu Lele, Mimikyu, and Metagross for strong super effective damage. Recover is listed to allow Porygon-Z to abuse its +1 defenses and replenish some HP, though at the cost of vital coverage. Lastly Protect is here to scout or position Porygon-Z for a better turn. 

Now keep in mind the opponent will do their best to prevent this setup either with disruption or plain hyper offense. In that case, provide Z-Conversion Porygon-Z with proper support from having a Follow Me user like Clefairy (helpful with Friend Guard), Intimidate support (Arcanine, Salamence, Gyarados, etc), Aurora Veil/screens, etc. Once setup, the goal is to overwhelm the opponent using Porygon-Z new conversion type (in this case Electric) and inflict as much damage as possible to where either it can sweep, or its team can pick off the remaining threats. Though not necessary, Electric Terrain from Tapu Koko can certainly allow Porygon-Z to hit immensely strong with Adaptability STAB Thunderbolts. To get an idea of how strong Z-Conversion Porygon-Z is with STAB Thunderbolts, here's a list of Damage Calcs below:


Offensive Calcs

Choice Scarf

 

Porygon-Z @ Choice Scarf  
Ability: Adaptability  
Level: 50  
EVs: 4 HP / 4 Def / 252 SpA / 4 SpD / 244 Spe  
Modest Nature  
IVs: 0 Atk  
- Tri Attack  
- Hyper Beam  
- Ice Beam  
- Dark Pulse / Thunderbolt / Shadow Ball

Milestones:
- Adabtability Hyper Beam OHKOs most "frail" Pokemon that aren't Focus Sash or Specially Defensive. 
- Outspeeds Scarf Bulu / Smeaegle and neutral speed Pheromosa.

This Choice Scarf Porygon-Z set was popularized by Sejun Park after winning VGC Tour in Korea (link of his team is there). The most powerful move on this set is Hyper Beam, especially when paired with its Adaptability. To best describe the reasoning for Hyper Beam on this slot, its practically a "One-fo-One" trade as stated by Sejun himself since Porygon-Z is most likely going down. By using a full power Adaptability Hyper Beam, Porygon-Z can OHKO most of the meta that doesn't have natural or invest heavily into special defense. Keep in mind, the huge opportunity cost of using Hyper Beam as Porygon-Z will have to recharge, thus allowing the opponent to recover from the hit. Tri Attack is the safer Normal-type STAB with the 20% chance to either burn, freeze, or paralyze the opponent, which can definitely sway the battle. 

In terms of coverage options, Porygon-Z has a plethora of special attacks to pair with its high base special attack and scarf. Ice Beam allows Porygon-Z to hit opposing Dragon-, Grass-, and Ground-types such as Garchomp, Salamence, Krookodile, Tapu Bulu, etc for super effective damage and thus an invaluable coverage. The last option really depends on Porygon-Z's own team composition given all three attacks listed are for specific threats. Dark Pulse is great for opposing Psychic-, and Ghost-type such as Alolan Marowak, Metagross, Gengar, etc considering how it forms perfect coverage with Porygon-Z's Normal-type STAB. Thunderbolt forms perfect coverage with Ice Beam and can hit opposing Water-, and Flying-types such as Gyarados, Celesteela, Tapu Fini, and others. Finally Shadow Ball is listed here in case certain Pokemon  like Mimikyu or Tapu Lele are a concern, while still hitting opposing Ghost- and Psychic-types. 

To see how strong Scarf Modest Porygon-Z hits, look at some of the damage calculations featured below:

 

Porygon-Z @ Normalium Z  
Ability: Adaptability  
Level: 50  
EVs: 4 HP / 252 SpA / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Hyper Beam  
- Tri Attack  
- Dark Pulse / Ice Beam / Thunderbolt
- Protect

Milestones:

- Adabtability Z-Hyper Beam can...OHKO stuff.
- Pew

So what can be scary facing a Hyper Beam Porygon-Z? Well the answer is right there. Z-Hyper Beam. To elaborate, the idea of using Hyper Beam on Porygon-Z is the same as the above set, however taken on an even more devastating approach. Most Hyper Beam-like attacks require the users to recharge after the use of the move as a simple opportunity cost. By giving Porygon-Z the Normalium Z, Z-Hyper Beam becomes a base 200 STAB normal move with Adaptability to reach a max power of about 400! The best part of using Z-Hyper Beam Porygon-Z is the the fact it doesn't require a turn to recharge, thus allowing Porygon-Z to fire a slightly weak, but still powerful regular Adaptability Hyper Beam. In terms of coverage options, Porygon-Z still has some strong options to consider. STAB Tri Attack can be used in case Porygon-Z wants a safer Normal-type STAB with some added effects. Dark Pulse rounds up Porygon-Z's perfect coverage with Normal- and Dark-type coverage to hit most of the format for at least neutral. Ice Beam can be used for Dragon-, Grass-, Flying-, and Ground-types, while Thunderbolt is for any annoying Water-types in play.