pokemon legality issue

[Giselus]

After each pkhex update, some of my generated mons are flagged as illegal. Even though they were recognized as legal with the previous version.

is it normal? 

Flagged Boîte 1.bin

[Kaphotics]

Refer to the program changelog. This is mentioned:

 - - Fixed: Gen4 HG/SS Bug Catching Contest/Safari encounters now correctly check for the 4x 31IV reroll attempts. Thanks Unknown Warrior!
 

Improvements to legality checking will add new flags, checking for things that were previously unchecked.

1 hour ago, Giselus said:

some of my generated mons are flagged

Since they were generated, I doubt they are actually legal (moreso just not flagged by prior versions).

[Giselus]

I appreciate the clear explanations.

That serves as a reminder to always remain cautious; generating is always a bad idea, even for old games. Do it at your own risk.