Made a video..
Senran Kagura Estival Versus - Teamwork TrophyA combined aerial rave is when your character and her partner team up during an aerial rave. As such, this trophy can only be attempted on cooperative missions, missions that feature your character and an A.I controlled partner.
Mission Summer makes me crazy
( Day 1 - mission 3) is the best place to do it..
Knock her health down to about a third, and launch her into the air allowing you to chase her by pressing Circle . While in chase, slash her up a couple of times and press the touch button to activate combined aerial rave.
She must be defeated for the trophy!