well im curious what exactly is needed to make trainers(I dont have the skills I dont think) but was just wanted to know what is actually needed
General knowledge of how pointers work is the biggest thing if it is a simple game. If not then pointer knowledge and some assembly knowledge. Most games are fairly easy to mod though if you know how to use cheat engine which does a lot of the work for you.
-able to code
-understand how memory is laid out