Size and Mark editing in Gens 8 and 9

[Jacinthe]

I have some questions regarding the ability to edit scale and marks on pokemon from wild encounters and scale on event pokemon from generations 8 and 9.

 

1. Is it possible to edit the scale of a pokemon and add a personality mark while keeping it legal? If so, how do values like height, weight, scale, marks, IVs, nature and PID interact with each other?

 

2. If you can't predict height, weight and scale natural combinations, how does PKHeX legally generate those values when creating pokemon from the encounter or event databases?

 

3. Is there a difference between gen 8 and 9 games when it comes to the predictability of the generation of scale and marks?

 

4. Related to that topic, I downloaded the shiny Zacian WC8 file and opened it in PKHeX. I noticed that every time I did it, Zacian had a different height and weight value.  I assume this is trying to emulate random values you'd get when redeeming the event in-game, which leads me to believe these are predictable in SwSh.  The shiny Miraidon WC9 file, on the other hand, had 0 height/weight and 128 scale every single time I opened it. Are those values set because of how they work in-game or a just safe default values PKHeX since it can't predict other combinations?

 

Thanks in advance!