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Reposting weird stuff list from past thread train
Within Gen VI
>AZ's floette was in XY but cut for unknown reasons, might return a la Mega Lati@s and Complete Zygarde but who knows
>Pic related, can link to the Noppera-bō, a faceless, humanlike creature that is rumored to consume its victims entirely, then take on their form without a face
Between Gen VII and past games
>Project AZOTH was stated by both Aqua and Magma to return the world to its start, Azoth is a city introduced in Magearna's movie
>Sina and Dexio appear in Alola some time after X and Y take place with the Zygarde Cube, implying an extension to Kalos lore
>Colress, a known researcher, has a look similar to the Aether foundation, but is just coincidental at this point
>AZ, Alpha and Omega, Day and Night have a huge "Beginning and End" motive, might be relevant
Within Gen VII
>Type: Null is a man-made mon, suggesting a connection with the Aether Foundation, a research group, but again, coincidental
>UB01 has shapeshifting powers and acts like a young girl, heavy implying a connection with Lillie
This is definitely old, so if anyone can remember anything else, please add.