Try in-game saving again. If it gives you an error message, then you can just download the newest version of Dolphin and that will fix your problem (I know because I had the same problem). Try loading it up and formatting the memory card first though, and then just finish the prologue and try saving in-game, and see if you get an error message. If there is no error, then your ingame saves should work normally.
Arch
Intel Core i7 - 4510U
iHD4400
8GB RAM
Check here first:
wiki.dolphin-emu.org
Intel Core i7 - 4510U
iHD4400
8GB RAM
Check here first:
wiki.dolphin-emu.org