I used the move "Trick Room" with my Whimsicott (Prankster), but Mega Swampert attacked first, ignoring the ability.

prankster elevates the priority of a move by +1. TRs priority is -7 so with prankster it becomes -6

 

Will still be used in last or trick room will be broken in VGC with Whimsicott

Edited September 12, 2025Sep 12 by Mysticwind

Good Day @Z4ngad0

 

As @Mysticwind has stated, Trick Room has a -7 priority and with prankster is becomes -6. Specifically, the ability Prankster does not guarantee that non status moves will move first but rather it increases the priority tier by +1. In general, the ability Prankster allows non status moves with a base priority of 0 (such as Memento or Switcheroo) to move before most other moves. 

 

Another instance of this memento used by a Prankster Pokemon not going first if were against a Pokemon using Extreme Speed. In this scenario, Memento would have a +1 priority (boosted by Prankster) while Extreme Speed has a +2 priority.

 

I hope that this explanation eases your confuses and provided you with a better understanding of how the Prankster interaction works.

 

Does this answer your concern?

 

Regards,

Bitterblade

Ty all 🙂

Good Day @Z4ngad0

 

You are very welcome. It appears the topic has been resolved and I will now be closing this thread.

 

If you have any further questions or concerns do not hesitate to reach out.

 

Regards,

Bitterblade