Since a direct native editor for Android is limited, the most reliable method involves using on a PC and then transferring the file to your phone.
If you prefer manual file management using a tool like ZArchiver, look for your files here: ps2 memory card editor android
: You can replace the standard 8MB card with a 64MB image to store more saves without constant swapping. Simply download a 64MB .ps2 file and rename it to Mcd001.ps2 before placing it in your emulator's memcards folder. Since a direct native editor for Android is