Board Thread:Questions and Answers/@comment-2601:19B:4600:5059:20F9:A796:3B6B:A0F2-20190518163926/@comment-36894054-20190702155631

Go to Edit Deck and select Raid Battle Deck. Pick a tab and start filling with your strongest attackers. Deck rank will be shown at the bottom. If it doesn't say SS then you probably need to level up so you can slot in more units.