Hey so an update lol....i got all the damn shards and bought all of Domas stuff for that trophy. So all i had left was the co-op one where you have to use your partner in battle 10 times (the dude and the girl). Each 10 times, so 20 total. You only can use the dude in chapter 1 and then the girl in chapter 3.
My first playthrough of course i didnt know this so i only used the girl 10 times and never used the dude in chapter 1 the 10 times. So going into new game + the thought was that the 10 times i used the girl in playthrough 1 would carry over and then all id need to do is use the dude 10 times in chapter 1 and then get the last trophy and the platinum.
Wellllllll......i used him 10 times last night in chapter 1, at least 15 times to be sure, and nothing. So.....the dumb bastards didnt make it so any you do in playthrough 1 carry over, so now i have to play through chapter 3 again and use the girl 10 times and then HOPEFULLY i get the last trophy. So just an FYI, if you did playthrough 1 like i did, youre gonna be in the same boat.