I've been playing GBC games on my Raspberry Pi using the RetroPie OS. More specifically, I've been playing Shantae using RetroArch's GBC emulator. When I found out that certain features are only available on the Game Boy Advance, I moved the save file to my PC and loaded it into RetroArch.
I'm trying to load my old save file on a GBA core so that I can get the exclusive content, but I can't seem to use any core other than Gambatte. If I load the Mednafen-VBA core and then load the game, it either automatically loads Gambatte (If I use Detect Core) or Shantae doesn't appear in the list of available games (If I use Mednafen VBA-M).
Is it possible to force this file to play under a GBA core and access the hidden content? Failing that, is there any way to apply cheat codes to a GBC game using RetroArch? I was only able to find cheat codes for RetroArch's PSX emulator.