The solution is simple:
Open your file manager. Navigate to: Internal Storage/Android/data/xyz.aethersx2.android/files/ If you do not see this folder, you have "Scoped Storage" restrictions. Use a file manager like Material Files or connect your phone to a PC.
Remember to always backup your original saves, verify the region of your ISO, and stick to community vetted sources like Discord or archive.org. Now, go tear the head off the Hydra—no grinding required. Keywords used naturally: god of war 1 save data aethersx2 hot, AetherSX2, God of War 1, Kratos, PS2 emulator, memcard, save file, Pandora Temple.
Download the god_of_war_1_hot_save.ps2 file. Rename it to Mcd001.ps2 (or Mcd002.ps2 if you want it as a secondary card).
Rename your current memory card from Mcd001.ps2 to Mcd001_old.ps2 . This avoids overwriting other PS2 games you are playing.