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-Regigigas is called the guardian architect
-It is confirmed that Regigigas has multiple bodies all over the planet and it is said that Regigigas is like a network of servers/PC's or something like that (similar to Zygarde)
-The minor Regis were built by Regigigas as a countermeasure in case of natural catastrophes or the possible invasion of "deep star calamities"
-Regigigas doesn't have a new form, but you can replace its ability for Telepathy, if you bring a Regigigas from Pokémon Home.
-Calyrex is the master of Zacian/Zamazenta, he taught them how to seal Eternatus.
-Calyrex indirectly influenced Rose with its powers to awaken Eternatus.
-AZ appears in the DLC
-new variants of old pokémon, such as Kabutops and Aerodactyl Ghost/Water - Ghost/Dragon
This could be fake btw :^)