NPC in Calcenon City Pokémon Center - certain choices

[blazingcamerupt]

I talked to one NPC in Colcenon City who gave me a choice to select some conditions for the game such as 252 evs for opponents' Pokémon. which was a dumb move because it made the game harder. I am aware that boss teams have full evs but not regular trainer Pokémon unless this was  changed. The NPC left before I realized what I had done. Are these choices reversible or is my game stuck like this forever?

Is there any way to reverse the choices that I had picked?

 

 

[Dreamy]

The NPC should be enabling password functionality for old saves - I think most of these *should* be disableable from the password menu at a PC (but certain ones aren't reversable)

[blazingcamerupt]

I did not start at Episode 18/19  (started at episode 13) so I never set up a password. How would I reverse these changes? I checked the PC and add a password that requires a data chip. Can I reverse these changes when I have a data chip?