I notice you asked for a in the first line, then said "give me a story" in the second.
Accessibility & localization
This is the most popular dedicated Android app for the job. ps2 memory card editor android
Ever bought a Japanese import of Metal Gear Solid 3 only to find your American save file won’t load? The Android editor allows you to manually hex-edit the region header. With a few taps, you can toggle the region flag, tricking the game into accepting saves from different territories. PS2 memory card editor for Android I notice
Here is what you can do from your phone screen: The Android editor allows you to manually hex-edit
Search for the game title (e.g., "GTA San Andreas" in ASCII) or use known offsets from cheat databases.