Can I play a friend with Share Play or is it just for watching purposes? If i can would someone be able to tell me how?
Quite a few ways but it might be confusing.
You could load a game, with two controllers on your end, one on each team, start share play “pass the controller” to your friend which means he’ll take over and you’ll be using the secondary on your account. You could play 1v1 with regular teams outside Diamond Dynasty.
If you bought the digital copy and not the disk. You can also load your PS account on a friends PlayStation if they are a close friend you trust and they can download it on one additional PlayStation. You could then play each other on your own account with any restrictions diamond dynasty included.
Just make sure after they download the game they put there old account ad the primary account, otherwise when they load out, you’ll get kicked off.