totally fair. i made the area zero lab idea to kind of parallel the aether foundation as like a lore thing, i agree making it for koraidon and miraidon only is kinda.... eh, but my idea is to potentially have all the paradox stuff moved there so it serves a purpose other than that. would definitely put more things on staff's plate though. (also pledge grove is there just to get one legend's form change so in that case i do feel there is a bit of a precedent to have a unique area for a certain legendary.)
as for the dex thing... yeah, it's kinda difficult. it being a koroku/kyukori situation would mean they'd technically be considered "evolutions" of cyclizar, which is weird.