What Shadows did you find using most with Joker? And why?
I found physical counterers like Girimehkala and Rangda as soon as I get them.
I used Girimehkala alongside Trumpeter and Beelzebub to win again Caroline and Justine. Just those 3 after a lot of skill training.
Apart from them, I switch an upgrade pretty frequently. Usually after they stop learning moves.
I tried to use everything at least once, but some I didn't.