Meowdoleon

While it is a very minor glitch, and can wait some years if it needs too, I like debugging and letting programmer knows about flaws in their coding. I consider it as constructive critics.

So, I just evolved my Magikarp, and it still flags it as illegal, so I guess it doesn't have to do with the ability system.

They come from a save I deleted a long time ago to begin my FireRed game anew. I moved all my box to Platinum to safe-keep them. The exception would be Dewgong, which I transfered over my Platinum save because I didn't have any Dewgong in my Platinum pokedex. I unfortunately don't remember anything about their met place, but the met levels was the same as those that you can see in the screenshots. If it is a problem with the PID, then it would be necessary to change PKHeX recognition system to flags Pal Parks PID as fishy, instead of illegal, because there is a glitch with the ability system and the PID attributed. The way that I could verify this is by evolving my Magikarp, since it gives a correct PID upon evolving.

What do you mean by the capture details?

"Despite the player in the Generation IV game catching the Pokémon again, its OT, ID number, and Poké Ball remain the same. Its friendship is reset to 70." https://bulbapedia.bulbagarden.net/wiki/Pal_Park#Modifications_to_transported_Pok.C3.A9mon Edit: It may be worthwhile noting that if I modify the Ball to a Poké Ball, it does flags it as legal. If I try to put any other Ball, it will flags it as illegal.

@wrathsoffire76 As you can see in the screenshots in the first post, Gyarados is in a Net Ball, Magikarp and Dewgong are in a Great Ball.

@Ruby Genseki No, they weren't modified in any way. @theSLAYER The met level of Magikarp is 8 and the Met level of Gyarados is 21. Edit: Also, I tried Rerolling the PID, it still flags it as illegal.

Some Pokemon are flagged as illegal in PKHeX, saying that they "Can't have ball for encounter type." Some other Pokemon aren't flagged as illegal, while they have the same type of ball.

I found an issue with Pokemon that are transfered from Firered to platinum through the Pal Park. The first time you view a Pokemon when you load a Platinum save, if the Pokemon come from Firered and that you didn't viewed another Pokemon in another savefile in the same instance of PKHex, it will say that the Pokemon is illegal because it doesn't come from the Pal Park. The information will update for all the Pokemon transfered from Firered if you view another Pokemon. This is very minor, but is still there.