Legality Check Difference Between PKHeX 210130 and 210406

[foohyfooh]

Not sure if it an actual issue or just that the legality checker is just better, but I am just mentioning it just incase. I was using PKHeX to modify a Galarian Moltres 146-01 - Moltres - B61B5E5EEB9C Original.pk8 from ROC-PC

This is the spread I am trying to change it to

Moltres-Galar @ Safety Goggles  
Ability: Berserk  
Level: 100  
EVs: 92 HP / 52 Def / 108 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Fiery Wrath  
- Air Slash  
- Taunt  
- Protect

When using 210130,  it is showing as valid and here is the resulting Pokemon 146-01 - Moltres - B9EE5E5EEB9C 20210130.pk8

When using 210406, it is showing as invalid and here is the resulting Pokemon 146-01 - Moltres - ECADEE5210B1 20210406.pk8

Also, know that the 210130 one is showing up as invalid in the 210406 PKHeX and the 210406 one is showing up as legal in 210130 PKHeX . So I at least believe it is limited to the legality check rather than any other changes PKHeX may be doing that I am not aware of.

[ReignOfComputer]

Use Bottle Caps to get the desired IVs. PIDs have been found to have a correlation with wild encounters, making any changes to a legal Pokemon will result in an illegal PID for now.

[foohyfooh]

It is becuase there are no 0IV bottle caps is the reason I had to change the IVs, but thanks for reminding me that the PID is related to the IVs.