If you find mobile editors too limited, the most robust method remains using the full PC version of PKHeX . You can upload your Android save to a cloud service like , edit it on a computer, and then download it back to your phone.
Pokémon Generation 3 save files ( ) on Android typically involves using either a mobile-friendly web editor or a dedicated Android app. The standard practice is to locate the .sav file generated by your emulator, modify it, and then replace it. pokemon gen 3 save editor android