heartgold HeartGold Save file got corrupted

[Mihanya]

Greetings everyone.
So, as i stated in title, my save file got corrupted.

Long story short, i played HG little by little for a few years, everything was fine.
But yesterday, when i tried to launch the game, i got a red top screen with a bunch of dots. Turn off/on, and again red screen.

Found similar problem on a reddit, their solution was to change a rom. Did it. Nothing changed.
Changed a save fille to a different one, and game runs fine. The problem definetly in save file/
But beside adding Mystery gifts at the begining, i didn't do anything to a save file.

The only thing that was changed recently (~1 year), i moved from twillight to a NDS forwarder, but after that, game still played fine.
 

4780 - Pokemon HeartGold (U)(Xenophobia).sav