Naganadel stacks your opponent's prizes, looping with Misty & Lorelei, Exeggcute, Lusamine, and Aqua Effect Vaporeon
Brambleghast takes prizes setting you down to 1 which enables your opponent to use Slowbro with Twilight Inspiration.
Loop this effect using Lusamine, Exeggcute, and Magnezone to increase Brambleghast's HP as desired
Opponent will then use a Raticate to set Brambleghast's remaining HP to 10, then next turn smash with Sableye V for bonkers damage