You can get alot of them at xboxsaves.com and for the most part only evox can use them...although what you can do is run evox as an app to run the trainers. OR create a scaled down version of evox with nuthin but the bare bones configuration and use it JUST for trainers. Kinda like a gameshark....and just keep it in your apps folder,yada yada.
Just make a trainers folder on your evox.ini or what ever or get the evox.ini with the traienrs folder already there then put the trainers in there.