Pokémon Reborn / Shout Out

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During the Labradorra Tournament, Terra does her own version of the "man your man could smell like" commercial.

After the Grand Stairway is destroyed in Northern Obsidia Ward, you can find a civilian who will say "On this day, humanity received a grim reminder..."
The highest rank you (or a combatant Pokémon) can reach on High Striker? Over 9000, of course.
There is a period of time between defeating the Pokemon League and the post-game during which the player character vanishes. Julia decides to take the opportunity to spread a few rumors, a couple of which are references to other media.
Luna: When I first returned ahead of you, Julia told me you had willingly been imprisoned on the moon. Something about sealing Lin in there so humanity's negative energy could never reach her to give her power.

Among the many Shout-Outs given by Terra, during the Labradorra Tournament, she mimics an iconic scene from Troll 2:
Terra: 1'LL DELETE 1T. AND TH3N 1'M GOING TO DELETE YOU! OH MAI GAWWWWWWWWDDDDD!!!!!!!!

One of the fishermen on Apophyll Beach, when commenting on all the Grimer in the water, mutters "One grime to rule them all, and in the murkness, bind them".
In Lapis Ward, there is a lady named Lenore who uses a Luvdisc and a Murkrow.
When battling on a Mountain field, the text box opens with this quote:
Adieu to disappointment and spleen. What are men to rocks and mountains?

At the end of the chase scene in the postgame, Terra lets out a "STOP!!!" before pulling out a gigantic mallet and saying "Hammer time" before bowling everyone else involved in said chase.

You can join the Magma Gang or Aqua Gang, lead by Maxwell and Archer respectively. It's lampshaded to hell and back by both leaders.
This rehash of the Magma and Aqua conflict ends here!!
In Ametrine City, a guy is having a problem with his computer. Once the problem is fixed, he says it's time to get back to solo queue.
During a sidequest in Episode 16, you get a crystal ball worth 100 million yen and with a 30% prediction rate.
In the Onyx Arcade, the staff watching over the roulette tables paraphrase one of the songs from Persona 5, The Whims of Fate.
Let's spin the wheel. See where it might fall? Give into temptation!
Ametrine Mountain plays host to Lapras on Fridays, much as Union Cave did in Pokémon Gold and Silver.
When entering the Glass Workstation, Bennett mentions how it's a shame there's no Sleep Clause in reality, referencing one of the rules established by competitive Pokémon community Smogon.

There's a kid in Spinel Town staring at a train who says "I like trains."
On 7th Street there is a cult dedicated to The Helix Fossil. Additionally there is a Trainer with a Charmeleon named ABBBBBBK.

A woman recites a modified version of Avatar: The Last Airbender's opening narration in Coral Ward before the Gym Leader, Adrienn, returns. This is actually a subtle hint as to why and how they disappeared, as well.
There is a period of time between defeating the Pokemon League and the post-game during which the player character vanishes. Julia decides to take the opportunity to spread a few rumors, a couple of which are references to other media.
Cal: [Player]? You're back? But, how? I was told that you had... turned into the moon? And, like, that's rough, buddy.