Sebeeeee

well i'll just start a new save i don't wanna risk bricking my 3ds while installing a cfw thx for your help everyone 

isn't there a decryption app to download directly on a pc?

would be easier

1 hour ago, AlamosIT said:

In this guide, one of the first steps is checking if you already have CFW.

i don't have a cfw then

I will try even though i have no idea if my 3ds as a cfw. i dont have a lot of knowledge in this

1 hour ago, AlamosIT said:

Where did this file come from? A valid Pokémon Y save file should be a file named "main" (without extension), with the size of 405KB.

In actual hardware (3DS/2DS with game cartridge or digital copy) a save file must be extracted AND DECRIPTED using a Homebrew save-manager, like Checkpoint (little guide here).
This assumes that you have a complete CFW setup on your 3DS console (complete guide here).

If you are using Citra you should take a look here.

i'm using sky3ds+, these .sav files get created automaticaly when the rom (that i digitalized legaly) gets recognized by the cartridge, i think

ok i'll try homebrew but i thought PKHeX could recognise .sav files

what do you mean it's not valid?

I wanted to edit my save file but this error showed up, it's my first time using PKHeX and idk why it doesn't work
i don't think the save is corrupted cause it works fine when i play the game

pls help

Pokemon Y (EUR) (En,Ja,Fr,De,Es,It,Ko).sav