Hey
I was stuck on this trophy for almost a year or more, needed six arcade requests. Couldn't match with anyone I knew from boosting threads or friends.
At a last attempt, I created a user for my son and had two copies of the game and two vitas. It did connect on the same home network!! Which is exactly opposite of what everyone was saying on threads and guides! it worked like magic, matched pretty fast. I was using Burst arcade mode, he kept interrupting me during the mode, on the last request trophy popped up.
Truly happy to have gained one of the last three trophies remaining for me towards platinum, but after a hell of trying to be interrupted by other players, this worked out opposite to all counter claims.