Hello and welcome to the community. 
Trainers will trigger a false positive with antiviruses every now and again, no matter where you get them from. This is purely because of how they work and they are completely harmless.
In the future please use the search button before posting. This query has been addressed many times. For example, this post here explains in depth why it happens and how to resolve it: My antivirus marked WeMod as a Trojan - #2 by Ravenfyre.
Thank you.