Another complication which you might enjoy thinking about is the move Assist[0]. It will randomly use a move that is known by something else in the party which would be more difficult to prove no shenanigans without revealing any information. It isn't valid to be selected post gen 7 but, e.g., Showdown still has gen 7 (and prior) ladders.

[0] https://www.serebii.net/attackdex-sm/assist.shtml