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It's technically possible, although It would probably be easier to change the basic info of a donor save near where you want to be.

As mentioned in that article I linked, only certain mons are affected. (bred mons aren't part of it) Also in that article, I mention EC-PID-IVs-HT-WT are linked. I also mentioned Raid mons are linked a differently way, but not checked for yet.

no.

I'm under the impression the user wanted a legal shiny Arceus. If so, then read my reply. If not,read LilSmooshy's reply.

No Arceus in Gen 4 can be legally shiny.

Literally files I uploaded. Removed.

Just made some. To make them shiny, use Method 1 Reverse PID. Gen 3 - Shiny Unown incomplete.sav note: It's gonna be hard to control the forms, since forms is tied to PID in Gen 3. probably easier to simply gen a TID/SID combo that is legal with the PID of existing Unowns additional note: it appears PKHeX doesn't verify the forms legality in terms of location. (edit: it doesn't at time of writing. It does now) it might not check for encounter slot too.