Shinra finest is an event to see how fast you can kill 100 Shinra’s soldiers/machine. If you can kill them in 30 sec, you will get 1 major dark orb, 1 greater dark orb and 1 dark orb. So it is a great time to farm major dark if you have time. The best RW is Shadow BSB as they are weak to dark. So get ready to add as much shadow friends if you plan to farm on it. Mine is G8vP and it is set for FF VII now.