Mega-Z Ring Sidequest

The Mega-Z Ring Sidequest can be started as early as after the player has earned Badge 08, but the bulk of the quest will remain unavailable until the player return to Reborn City after obtaining Badge 13. The first step of the Quest takes place on 7th Street. 
==7th Street==
Located on 7th Street is the Pokémon Black Market. The Pokémon for sale here should look familiar; they were the ones that helped the player escape captivity during the Blacksteam Factory story segment. 
 
Each of the Pokémon here can be bought for a variable amount of shards. If Ditto was not obtained during the Blacksteam segment, it will also be here for sale. Their prices are as follows: 
After purchasing at least one of the Pokémon, leaving the market will prompt Arclight to appear from behind a building. He'll explain that he wants to shut down the market, but he can't do that while there are still Pokémon for sale, so he tasks the player with buying all of them. 
The player needs to buy all of the Pokemon in the cages to continue the quest. After the player buys all of the Pokémon, Arclight will give the player a Lucky Egg and tell the player that in light of not being able to find their owners, he asks that they take care of them for the time being.
Some of these Pokémon will be necessary for progression of the Quest later. Do NOT release Vanillite, Loudred, Makuhita, Roggenrola, or Jigglypuff. Evolving them is okay. The rest are free to use.
==The Nightclub==
After the player has earned Badge 13, they can return to Reborn City. If, when returning to Reborn City, the player talks to Ame in Grand Hall, the story will progress, and this next still as well as the Mega-Z Ring will become unavailable until after the player has earned Badge 15. It is for this reason that Ame should be avoided until the Ring is acquired, for else several Gym Battles must be fought without its benefits.
Before continuing with the main story line, Arclight can be found in his Nightclub, in the main foyer. 
Here, he'll explain that while he wasn't successful in finding the owners for all of the Pokémon, he at least found five, them being the ones mentioned above. He will task the player with bringing each of those Pokémon back to their owners, but unfortunately this process is easier said than done. The five owners are:
*Lillin from the Jasper Ward, who lost her Loudred
*Felicia from Apophyll Academy, who lost her Makuhita
*Mr. McKrezzy from the Lapis Ward, who lost his Roggenrola
*Santiago from the Peridot Ward, who lost his Jigglypuff
*Eustace from the Lapis Ward, who lost his Vanillite
Giving each of these trainers back their Pokémon have steps that interlock with one another, so it won't be a simple fetch quest. Consider it closer to a wild goose chase. It is recommended that the owners are contacted in the exact order presented below.
==Santiago==
Santiago will be in the North Peridot Alley, along with a couple of his "friends".
Santiago has a bit of a unique way of speaking. Nevertheless, the player can inform him that they're here to return his Jigglypuff. Unfortunately, Santiago cares a little too much about keeping up appearances with his friends, and declines to take back his Pokémon at the moment, saying he'll be made fun of. He instructs the player to find somebody who can watch over his Pokémon for him for the time being. Before being allowed to leave, however, Santiago asks to battle the player, so that his friends don't get suspicious of their conversation. 
Santiago is battled in a fieldless Single Battle format.
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The next person on the list, and the one able to take care of Santiago's Jigglypuff for a spell, is Lillin, who can be found in the Jasper Ward.
==Lillin==
Lillin can be found in the Jasper Ward Apartment Building closest to the southern entrance of the Malchous Forest Park. 
Lillin will show a surprising amount of discontent at the idea having to take her Loudred back, citing that it's far too loud and prevents her from getting any sleep. Compounded with also having to take care of Santiago's Jigglypuff, she isn't very cooperative. She tells the player she'll only accept their terms if they can find a way for her to comfortably ignore all the sound Loudred makes, and in the meantime she will be holding Santiago's Jigglypuff hostage. To alleviate this, Felicia is the next objective.
==Felicia==
Felicia can be found at Apophyll Academy, in the middle-left room connected to the center courtyard. Her priorities don't seem to be in order though, as instead of caring about being reunited with her lost Pokémon, she instead cares significantly more about the player's connection to Arclight. Before she's willing to take back her Makuhita, she asks the player to get an autograph from him,.
Return to the Nightclub and talk to Arclight to get his autograph, much to his dismay.
Returning with the autograph will prompt her to accept her Makuhita. However, Felicia also has an item necessary for the previous steps in the Quest: her Headphones. She isn't willing to part ways with them for nothing, however, and asks the player to get her something else in exchange: a second autograph.
The famous musician Mr. McKreezy can be found in Spinel Town.
==McKrezzy==
McKrezzy can be found taking a vacation in Spinel Town, in the second apartment building to the left of the Museum. While he is initially against giving out autographs while on vacation, he quickly changes his tune once the player reunites him with his Roggenrola. 
If the player contacts him before contacting the previous owners in the order presented above, he will only complain about the lack of service after getting the Roggenrola. Only after the player has done that will he gives his autograph to the player.
After the McKrezzy Autograph is acquired, the player can talk to McKrezzy again to do an optional battle with him. The reward for defeating him is TM 15 Hyper Beam. This battle is not required to complete the Mega-Z Ring sidequest. 
McKrezzy is battled in a fieldless Single Battle format.
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Return to Apophyll Academy and give the McKrezzy Autograph to Felicia, and she will give you the Headphones. 
With the Headphones in hand, return to Jasper Ward and give them to Felicia, who will gladly accept them. After that, return to Santiago, who can be told his Jigglypuff is in safe-ish hands. This still leaves the Vanillite without its owner, however. Eustace is last on the list, but far from the most compliant in the player's endeavor. 
==Eustace ==
In the Lapis Ward House to the left of the Pokémart is Eustace's mother. She explains that her brother is in fact Mr. McKreezy, and due to his immense fame, a gang has kidnapped her son in hopes of convincing McKreezy himself to pay the ransom. To figure out which gang has kidnapped Eustace, return to Santiago.
Santiago will confirm that it is his gang that are responsible for the kidnapping, although he wants no part in it. He instructs the player to go free Eustace, who is being held at the Rooftop Garden in the Onyx Ward. He warns them however, that the situation is a little weirder than they might expect. Upon taking the elevator up to the roof, the player will be ambushed by Santiago's friends, who will be fought in a double battle.
Q Gang Colin and Q Gang Matthew are battled in a fieldless Double Battle format.
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After defeating the two Q-Balls, Eustace reveals himself to be the mastermind behind his own kidnapping, hoping to steal his Uncle's fortune. Faced with no alternative, he battles the player in hopes of silencing them. There is no opportunity to heal between the Q-Ball Battle and the Eustace Battle.
Eustace is battled in a fieldless Single Battle format.
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After you defeat Eustace, he will begrudgingly fire his thugs and head home. Surprisingly, he explains the situation quite plainly to his mother. Unsurprisingly, she grounds him, probably for a very long time. She also mentions how he lit three apartment buildings on fire and raided Sigmund Connal's Orphanage not too long ago. Heading upstairs and talking to Eustace will prompt him to explain why he's such a little devil. Giving him his lost Vanillite changes his tune however, and for once he considers if he could use his maniacal genius as a force for good, although his first idea is still to steal his Uncle's money.
With all five Pokémon returned to their owners of questionable moral compasses, the player is free to return to Arclight for their reward.
==The Mega-Z Ring==
Return to Arclight in the Nightclub, where he will lament not being able to find the remaining Pokémon's owners. He tells the player to take good care of them, and as a reward for their hard work, gives them the Mega-Z Ring, which allows them to use one Mega Evolution and one Z-Move per battle (provided the requisite Mega Stone/Z-Crystal has been both acquired and equipped on the desired Pokémon).