Here is a pack I put together at the beginning of 2015. There is no information for the actual trainers in it, and it hasnt been updated. That being said, it is a good starting point for people who want trainers, and dont have any.
Update: Thank You Inkenet for this updated pack of trainers.
https://drive.google.com/open?id=1mPG-E9rYd22SuQA1UWgE7s3PDUEK-iV2 - Inkenet's 2018 Trainer Pack
https://www.dropbox.com/s/pcgk4g77sdb2qn2/Aurora_Trainers_1-7-15.rar?dl=0 - Original Trainer Pack from 2015
While I am releasing this, I wont guarantee that all of them will work with the latest TU's, and offer no support for the trainers included. Have fun. Also, since I copied this off my xbox, none of the trainers are labeled, and are all in folders based upon Title IDs.