- Ascended Meme: One sidequest has you go look for a Meowth. The first hiding spot is under a truck outside the motel...hang on. Wasn't there a rumour in the original games about Mew (a feline-shaped Pokémon) hiding underneath a similar truck?
- Dummied Out: Like Pokémon Sun and Moon, walking and running animations exist for the new Pokémon and transformations, despite going completely unused.
- Fan Nickname:
- "Ultra Solgaleo" and "Ultra Lunala" were popular names for the version mascots before it was learned that they were forms of Necrozma and not Solgaleo/Lunala wearing Necrozma's armor, in large part because of the "Ultra" prefix used for the games and all throughout Gen VII (Ultra Space, Ultra Beasts, etc.).
- "Carrotwolf" for Lycanroc's Dusk form due to its orange fur color.
- "Pennywise" for Blacephalon, with both being Monster Clowns who lure victims into a false sense of security before viciously attacking them.
- Thanks to being one of the hardest bosses in the entire series all on its own, many have dubbed Ultra Necrozma "the Destroyer of Nuzlockes" or some variant. Similarly, its unique Z-Move, Light That Burns The Sky, has been named "Light That Burns The Casuals" (though it ironically isn't used in said boss fight).
- "Ray (Kouta)" and "Ailey (Koumi)" for Elio and Selene because of their different character artwork.
- I Knew It!:
- The introduction of a new form for Lycanroc was heavily predicted, based on datamining listing additional model slots in S/M. Sure enough, this was confirmed with the reveal of the Dusk form.
- Thanks to the presence of a pair of Necrozma-like eyes in the official website's background◊, some fans believed Necrozma would have a then-unrevealed third form, with popular interpretations being its "true" state, or a being of pure light. Similarly, the conspicuous dragon head on the non-draconic Necrozma sparked beliefs that said form would be part Dragon-type. All of these were proven true, as either of Necrozma's fused forms can transform into Ultra Necrozma, a dragon made of light.
- One theory held prior to release was that Necrozma was directly related to the Cosmog line; such as a third evolution of Cosmoem or a "dead" state of Solgaleo/Lunala. As it turns out, Necrozma has no such relation to the line beyond using them as batteries for its alternate forms.
- Just like the Aether Foundation before them, almost everyone thought that the Ultra Recon Squad would be the real villains, even as (or rather, because) the advertising played Necrozma up in that role. As it turns out, while they do side with Lusamine at first, they're only concerned with restoring their world — and they soon realise siding with her probably wasn't a smart move.
- What Could Have Been:
- Looking at Necrozma's concept art◊, it appears Ultra Necrozma was supposed to look slightly different, as the wings and legs as depicted in yellow don't match up to the final version's. Most notably, what is labeled a tail is instead Ultra Necrozma's chest.
- Originally, the previous Big Bads only appeared as opponents in the Battle Agency. The scenario writer believed they could write a story around them, however, resulting in the creation of Team Rainbow Rocket.
Trivia / Pokémon Ultra Sun and Ultra Moon