So I struggled with Nessa. The Gym Challenge was kinda straightforward but it took me a while to see the solution. Drednaw also required power teamwork instead of just Chonkachu like I hoped,with it paralysing it, Electrike, Dottler (Robin after the FE character) and Corvisquire(Hawkie) being sacking fodder before Bra (Rufflet) dealt the kill blow.