BACKUP YOUR ARC AND DEF FILES FIRST!!!
Ok this isnt going to be easy to explain but I will try to simplify it as much as possible. If Hex editing is not your thing then this isnt going to be for you so give up now and save us both a lot of hassle.
I have almost finished my Winning04.pac file with all animations for characters from WWE13 & 2k15 that have been added as CDLC and it will be released in a few hours which will save you a lot of time. This guide is just for people who want