If my opponent uses Mime Jr's "Mimed Games" attack, what happens if I choose Pincurchin's "Follow-Up Kerzap" attack and the Mime Jr. didn't use "Stun Needle" during their previous turn?
Even if Mime Jr. had used Mimed Games to copy Stun Needle on the previous turn it did not use Stun Needle, it used Mimed Games. Therefore you cannot choose Follow-Up Kerzap if its conditions haven't been met; you must select a different attack.
Follow-Up KerzapMimed Games