Real Steel

Probably the most frustrating trophy of the game. The online is not very active and you can spend a lot of time looking for a match. The best way is to create your own session and to wait for someone to come.

There is a good point, as the online is dead, you will not have any problems boosting this trophy with a partner. Go to "ranked match" => "create session", then have your partner go to the "session list" and find your boosting session. See here for the boosting thread: LINK