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Type switching was probably the best way Aether thought of to deal with unknown ultra beasts suddenly showing up out of nowhere. They then researched myths about Arceus because that's what it was known for. Faba's research notes said that the first step was gathering info about myths from Canalave Library about Arceus. Type: full didn't necessarily have anything to do directly with Arceus, but it was built to be roughly based on the legend. Arceus used plates, but Silvally was built with DNA from pokemon from all types along with memory disks that activated type changing. RKS system was just named to reference the similar ability talked about in legends. Faba also developed the restraining helmet independently for his own benefit. In case the type: full went berserk, which it did. He probably added the Arceus ring as his own personal touch because he researched the legend.
