Yes, if you format the memory card by pressing Z, all of the saves for your other games will be gone.
Are you using memory card files or GCI folders in Dolphin?
Are you mixing save games from different regions on the same memory card?
Did you use save states as well as saving to the memory card?
Are you using memory card files or GCI folders in Dolphin?
Are you mixing save games from different regions on the same memory card?
Did you use save states as well as saving to the memory card?