how to make a trainer?

I assume you are talking xbox trainers since that is the only kind that I know of.

Most times this involves getting something such as an EvoX dashboard to where you can enable Debug TSR to where you can monitor hex variables and such and have the ability to make a trainer for them.

h t t p : / / x b o x - s c e n e . c o m

Sorry if this isn't what you were looking for....