[Other] How can i get pokemon sav key?

[RuneinA]

Hello, I asked some time ago how I could recover a Pokémon game that had been deleted, but no one knew. I've been researching and I've seen that when you delete a pokemon game you don't really delete the game but rather an encryption key that changes as you save in the game. I have done a test and I have seen that deleting a game already knowing the code beforehand, when putting it back in the game, the game revives!😊 Now, I have a deleted pokemon white game that obviously doesn't have the key. Does anyone know how to calculate that key? The localitation of the key is 0x23F90 the last four digits before the FF.
When you delete the game, the region from 0A of 0x47F80 to DA of 0x47F90 disappears, but except where it says 0A, which seems to be a save game sav counter, the other digits are always identical, except obviously those indicated (C0 DA) that are the key. Also emphasize that when you delete the game, the game from 0x00000 to 0x24000 is deleted but the one from 0x24000 to 0x48000 is not, here only the region mentioned above is deleted (C0 DA(The key))