This is indeed a bug. You won't even need a German/Italian save file to reproduce it.
If you set a German Pokemon to the save, PKHeX unlocks the Italian Pokedex entry and vice versa.
Thanks to @BLACKBIRD, in regards to the one distributed on Aug 19 and 20,
we've confirmed that the wonder card received is the exact same one as the previous one.
I'm uploading the new photos to the gallery.
Also, an interesting screen, telling you that you already redeemed it:
Here's something to help you (and anyone else who's interested): https://sta.sh/01e8ji836ni5
I made some blanks for new portraits. Keep in mind that if you want to add them to the game, you need to make sure they use at least or less than 16 colors and be indexed, 4bpp pngs with a size of 40x40.
I totally got mislead by this statement.
I thought it meant normal gameplay, but if I understand this correctly, it's related to debugging features in relation to the mobile com device
Researches of Hacky from GlitchCity Laboratories showed that if you ranked #1 in Battle Tower in Crystal you win a GS Ball. Amazing Link
He also did researches about the Odd Egg event: apparently when you first connect the Mobile Adapter you got it. I'll try in Crystal Debug.
I also learned is that most of gen4 wi-fi innovations were created in fact in gen2 with Crystal (I saw with crystal debug the ancestor of GTS that is in fact very similar to DP one).
Finally I read today that Masuda decided to make FRLG when they found the incompatibility of gen2 and gen3 mons mostly due to the mechanics of abilities and IV too.
If you all do submit files in Downloads, here is a link to the correct place to upload the pkm files (hopefully compressed).
https://projectpokemon.org/forums/files/category/64-pkm-files/
Back in business ^^
So I decided first to get all the non-buggy Pokemon from Pokemon Yellow Bug Town (Here for explanations). That was hard but I succeded.
Then I also found that you can still catch wild Wailord in Pokemon Prism thanks to the walk through walls code. But I still haven't find any fossil.
Finally I'll try to see if I can get the data of the surfing Pikachu from that game just for personal use.
Edit: I got it but each time I try to edit my save I got a save corruption. That's hard
022 - FEAROW - 60BC.pk1
027 - SANDSHREW - 6231.pk1
058 - GROWLITHE - A5E9.pk1
080 - SLOWBRO - 749A.pk1
100 - VOLTORB - A575.pk1
100 - VOLTORB - B161.pk1
115 - KANGASKHAN - 6400.pk1
123 - SCYTHER - D357.pk1