Android is a very versatile operating system that allows users to do whatever they like. And if we haven't got the knowledge necessary to get deep into business, there are tools that simplify the process. UniPatcher, for instance, an app to patch games and applications.
Patch ROMs of video console games on your Android
This app allows us to apply patches to ROM files and, therefore, modify them, without being valid for native Android games. Those patches can include all sorts of modifications, such as an increase to our money count, a translation, default skills for the characters.
The system to carry out the patching process is very simple. We only have to choose the patch, select the destination file, and finally save the result. Optionally, we can create a different file with another name to not overwrite the original one. You'll have to download the patches from the Internet or create them yourself, as they're not included in the app. By the way, it supports the following formats: PS, IPS32, UPS, BPS, APS (GBA), APS (N64), PPF, DPS, EBP, and XDelta3.