Thank you so much for the answer
Trying to understand the codes of the Powersave, there is one code that make my pokemon shiny, changing the IVs (and the PID).
If I want to keep the TID and SID, I can use this code, save the game, and later on change the IVs for desired gameplay?
Because I wish to have the pokemon like if I encountered shiny and perfect IVs (Legendary one).