ADCASC

Hey guys, new to nuzlocking. I have PkHex downloaded (I'm a Mac user) and I'm trying to upload my .sav file from OpenEmu into it but it keeps saying "Error: attempted to load an unsupported file type/size. This could be the caused by loading a different generation Pokemon file" I'm also trying to upload the .sav from emerald Kaizo but the PkHex keeps saying "Let's go Pikachu" version at the top. Thanks if anyone can figure it out!