Betrayed by the Trader

In this matchup with N's Zoroark ex vs Marnie's Grimmsnarl ex, your opponent has their full board set up to prevent you from causing damage, with Shaymin and 2 Munkidori's benched. With 1 Morgrem and Grimmsnarl also available, they will start biting away at your bench soon. This seems like an easy win, however, consider that you already used Zoroark's "Trade" ability (twice) and it didn't yield so well, or did it? I'm pretty sure there's a 3 prize move that will seal this game.