Is there a chance doing this would render the pokemon illegal? (Max IV's for soul silver caught Vulpix)

[Senko]

I caught a Vulpix in soulsilver (physical card on DS) and since its my favorite pokemon I was debating changing all its IV's to max values when migrating them through pokehex to the platinum game I'll be doing next (plan to migrate pokemon through all the regions in a ongoing playthrough). I was however concerned doing so might only change values going forward and not adjust existing stats e.g. raise IV from 5 to 31 and the HP don't change even though future level ups would give new HP increases based on the 31 IV. So I was doing some browsing to try and find if that would be an issue.

Which is when I found the tutorials about pokemon ID's and illegal mismatches. So since the main reason I have pokehex is just to allow transfers between games and I have no skill at all in editing files curerntly. I'm playing it safe and asking her first if I raise a pokemon's IV's to max specifically a Vulpix from soul silver could that get the Vulpix flagged as illegal?

Please bear in mind I have no real editing skill nor interest in acquiring so if the answer is yes I just wont do this, any advice on how to appreciated but will not be used. I want my Vulpix to be legal all the way through to importing into Violet/Scarlet.

[theSLAYER]

If you caught it in SoulSilver, then yeah I recommend not changing ANY data.

[Senko]

Thanks for the warning, I've already edited item data (got sick of the grind and gave myself rare candies) but I'll leave the pokemon alone.

[theSLAYER]

7 minutes ago, Senko said:

Thanks for the warning, I've already edited item data (got sick of the grind and gave myself rare candies) but I'll leave the pokemon alone.

yeah that should be okay since you aren't touching the mon's directly. You could also just hyper train the mon in later games (actual mechanic in the game). The stats would function as 31 IVs but the actual stat remains, so won't cause it to become illegal.

[Senko]

I'll probably do that, the only reason I was looking at hacking the stats is (1) Vulpix is my favorite and I'd like her to be the best she can (her special attack is 6 and her speed is 4) and (2) hyper training isn't going to be around till sun/moon which means I'll be going through platinum and sapphire at least first.