Hi, yesterday there was a problem with how Tricking Choice Items onto mons was reffed in a tournament, and I asked a few referees about it for proof but none of them really knew the answer.
So, Michael was kind enough to make a video of this! ^^;
Trick doesn't work like Encore, it's only locked into a move AFTER Trick is used.
Edit - Also, another thing. If Taunt is used and a move fails due to Taunt since it's a non-attacking move, Encore will not work. I've seen some people trying to ref it thinking it struggles or something, but Encore just fails in that situation. :o