WMG / Pokémon Gold (Fanmade)

Lyra will appear at some point in the story

Since Pedro Araujo likes to mix elements from the remakes with the events of the original games, like with Leaf in Red Fanmade, Lyra will be introduced at some point in the story (presumably related to the Route 34 Daycare Attendants and owning a Marill as a Mythology Gag to her games self as an NPC). She could either be a quick cameo, Gold's Love Interest and/or Kris' Sitcom Archnemesis (to reference the jokes made by the fanbase at Kris' expense when Lyra was introduced to replace her in the remakes).

• Unfortunately for Lyra, she has no chance to be Ethan's Love Interest, since that spot was already taken by Whitney.
• In Episode 20, Kris wears a Farm Girl outfit that does resemble her Adventures counterpart, Crystal, in the Heart Gold and Soul Silver arc. Said design is based on Lyra.
• Lyra does make a cameo in episode 31, but she's as young as Youngster Joey.

In the context of this series, Ethan's confrontation with Red will be at the request of the Kanto Gym Leaders.

As seen both in the Red series and the first part of the Gold series, the Kanto Gym Leaders see Red not as a mere champion, but as a friend, and they were devastated when he went missing. So after seeing Ethan's performance against the Johto Gym Leaders, the Kanto Gym Leaders will ask Ethan to find Red, who they'll describe as an old friend. Ethan will recognize Red as the Indigo League Champion, so he'll want proof they see him as a friend, leading to the battles against the Kanto Gym Leaders. After Ethan will be convinced (likely Misty, Lt. Surge, Erika, Janine and Blue will do most of the work since Misty is Red's lover, Lt. Surge is Red's mentor, Erika is Red's sister's mentor, Janine owes Red a favor for helping Koga join the Elite Four, and Blue is, in Red's eyes, the other Indigo League Champion), he'll end up looking for Red at Mt. Silver, the last place Red was seen, and after a heated fight where Red and Ethan will argue on whether or not people see Red as merely a champion (it's well-established Red dislikes fame), Ethan will convince Red to return to Kanto (we know Ethan will succeed to convince Red from the flash-forward scenes from the Red series, which take place after Sun and Moon, which takes place long after Gold and Silver).

Ethan Likes Older Women.

Just coming with this theory because he's dating Whitney, who, if I am to take a wild guess, is as old as Daisy Oak, and I don't think Ethan himself is older than Silver, who was a kid during the Red series. And the Gold series takes place eight years after the Red series. Though if I'm not mistaken, the age gap between Daisy and Silver isn't all that great, since otherwise Ethan and Whitney's relationship would have... complications.

• Moreover, the Time Skip of eight years means that Ethan must be around 18 years old himself - a young adult, so the age gap between the two shouldn't cause unfortunate implications.

The final chapter will be a Shout-Out to the Easter Egg - Snow on Mt. Silver creepypasta.

Yes, I know both Red and Ethan are alive and well by the time the events of Sun and Moon roll out. But given how it's established in a side-animation there's snow on Mt. Silver's summit (where Red is fought) and that Red became rather pale after spending some time atop Mt. Silver, it's likely that, once Ethan learns Red is atop Mt. Silver, he'll put himself in a Race Against the Clock to save Red from frostbite, and succeed to save Red just in time.

• Also, why did Ethan challenge Red in the epilogue of Pokémon Red? He knew the cold atop Mt. Silver has weakened Red's Pokémon, and he was asking Red for a fair and square rematch.
• Other two pieces of evidence supporting this: when he exiled himself to Mt. Silver, Red brought his Eevee, which evolved into Espeon in the meantime, instead of Lapras; and Ethan is similar to Blake in that they both had Cyndaquill as their starters, both are very reckless and determined, and both pay dearly for their recklessness (Blake with his life, Ethan by going broke trying to beat Whitney).
• The "Pokemon Tales: Lost Champion" animation and the teaser for Episode 17 make some nods to another creepypasta commonly associated with Easter Egg: Snow on Mt. Silver, namely Pokémon Lost Silver. The former is a monochrome animation about a lost champion (none other than Red) who wants his achievements to be forgotten (as his lines "I want my life back... Someone please take this gold medal away from me..." seem to imply), while the teaser for Episode 17 show Gold holding a Cyndaquill named Hurry, with fans theorizing that Lost Silver will be a Nightmare Sequence. (Given how Episode 16 ended with Gold challenging Morty, it's possible the Lost Silver reference will be a case of Mind Rape Morty gives Gold, much like how Sabrina gave one to Red.)
  • Confirmed about Morty (or rather his Gengar) using Mind Rape to reference Lost Silver.

When Gold will challenge Jasmine, Whitney will get jealous.

I mean, Jasmine has feelings for Gold (the player character), but Cannot Spit It Out. And given the rules of Cannot Spit It Out, Kris and Whitney will find out about Jasmine's crush before Gold. Given how Gold is dating Whitney at least at this point in time, well...

• Likely jossed. When Jasmine appears, she and Whitney appear to be friends and there are no signs of jealousy on Whitney's part regarding Gold.

When Pedro will do the Gen 3 games, May will be The Hero.

Norman, the Player Character's father in Ruby and Sapphire, is not only from Johto, but from Olivine City, Jasmine's hometown. And the fact Episode 20 shows that May and Jasmine are besties implies that May is Norman's daughter in this continuity.

• Pedro said in a comment that it is indeed his intent to have May be the protagonist of the Gen 3 series, mainly because he prefers her design over Brendan's.
• This theory can further be extended to Dawn being The Hero of the Gen 4 series, what with her cameo in Episode 21.
• Confirmed beyond a shadow of doubt. In Episode 23, we have some flashbacks of Jasmine and May playing together under Norman's watch, and of May moving to Hoenn eight years ago. Jasmine also stated that May has a full set of eight badges from Hoenn, with Silver then lamenting that May is just like Red and Blue who both have eight badges while Silver himself has no badges and Gold imposing on himself the challenge of obtaining sixteen badges. This brings in the possibility that May is the champion of Hoenn since both Red and Blue are champions.

Giovanni is the one shooting down the Team Rocket balloons every time they try to go back to Kanto.

After losing to Red at Viridian Gym, Giovanni disbanded Team Rocket... And now these guys are defying him. Clearly they need to be taught a lesson.

• Jossed per Word of God. In the comments for Episode 26, Pedro specifically says it was Red thunderbolting the balloons.

Whitney will be involved in the events of the Radio Tower.

She's aware thanks to Silver that something fishy is going on in the Radio Tower, and Team Rocket is shown to be very wary of her - to the point they increase the power of the radio waves when she returns to her gym. Either Team Rocket will attempt to kidnap/neutralize her, and she'll be a Badass in Distress by the time Gold reaches the Radio Tower (or a Damsel out of Distress). Or she'll team up with Gold and Kris to root out Team Rocket.

• Whitney is one of two Gym Leaders who are confirmed having access to a medicine that counters Team Rocket's radio wave sickness (the other being Jasmine). There's a good chance she'll team up with Gold and Kris, much to Team Rocket's horror when a Gym Leader shows up unexpectedly.
• Jossed. Because of a Team Rocket attack, Whitney is too injured to help.

May will help out in the events of the Radio Tower.

We see her talking to Jasmine about Gold and the strange occurrences, and that she managed to catch Rayquaza. With Archer rendering the Gym Leaders useless due to not wanting them to get in the way like they did when they took over Silph Co., Rayquaza being revered as a savior, and that Lance helped out in the Radio Tower events in canon anyway, it wouldn't be too far-fetched to say that May, wanting to meet Gold, would team up with him to root out Team Rocket; after all, she defeated two other villainous teams beforehand, so she could help with defeating a third.

• Confirmed. May not only comes to help (at Jasmine's request), but she also brings Rayquaza.

Team Rocket is responsible for Lance' infamous underleveled Dragonites

Last we saw him, he had two Dragonairs... And he's going to Lake of Rage, where Team Rocket's forced evolution machine is in action. Would serve them right, making their currently strongest enemy even stronger...

Gold's Quilava will evolve at the underground Rocket Base

Given that Pedro has been showing similarities and contrasts between Gold and Red, there's a good chance Pedro is setting up a similar event for Quilava to evolve at the Mahogany Town's Rocket Base like how Charmeleon evolved at the Game Corner Rocket Base.

• Jossed. Quilava evolved while fighting the Red Gyarados. Though just like Red's Charmeleon, Quilava evolved to defend his trainer.