Safe to use downloaded US/UM save to export pokemon to Sw/Sh?

[LAA]

Hey,  

As Pokemon Home released recently I thought about the potential of downloading a save for US/UM, and exporting the pokemon on that save to bank>home>Sw/Sh.

However I'm not sure if this would he safe to do. I'm very new to pokemon fields and etc. and from looking at PkHeX, I see fields like PID/SID/TID/OT to name the immeadiate ones.

 

If I want to use a save for the purpose I've described, should I be wanting to make it so all these pokemon have unique IDs and etc. And if so, what fields should I change and what's the best way to do it?

 

Thanks