Homebrew Question Pokemon bank for GBA games?

[Keylogger]

Hello,
I am playing pokemon GBA games with retroarch on switch and I would like to know if there is any homebrew or any way (like a pokemon bank for GBA or something) to save my pokemon from GBA games and why not, be able to use them of DS and 3DS games?

I know there is a pokemon bank for 3DS but what about GBA games?

Thanks

 

[Blue]

I'm pretty sure you can grab the saves from your SD card from each game, open a PKHeX session with each save (for example, one with Fire Red, one with Pearl), then just drag and drop them between boxes. Then export and use the modified save.