Trick room has a priority of -7, so the Pokemon that uses trick room will always move last. But what if a Pokemon with the prankster ability, Whimsicott for example, uses trick room? Does trick room move first or does it still move last? Help!
Unless somebody else uses a -7 Priority Move, Whimsy still goes last. Prankster increases Priority by 1. If it made Negative Priority completely nonexsistant, it'd be overpowered. So Prankster Trick Room is -6. Whimsy would go likely go last under the effects of Trick Room anyway.