It is possible that you can get 6 Prize Cards after using Beast Game GX Attack from Pheromosa & Buzzwole GX. Because if Pheromosa & Buzzwole has 8 Energy Cards and your opponent's Pokemon is Knocked Out from this attack, you will take 3 more Prize Cards.
You will take Prize Cards from GX Attack as follows:
Non EX or Non GX Pokemon : 4 Prize Cards
EX or GX Pokemon : 5 Prize Cards
TAG TEAM GX Pokemon : 6 Prize Cards
Full Article at https://ptcg92.blogspot.com/2019/10/pheromosa-buzzwole-gx-unbroken-bonds.html
