Z-Copycat isn't calling the correct move, while Copycat is.

[Cardshark000 5]

This glitch occurs while I'm fighting Amaria in doubles. The first turn goes like this: meowstic uses fake out on vaporeon, seismitoad uses surf and kills meowstic, Vaporeon flinches, then whimsicott kills seismitoad with giga drain. When I send in liepard on the next turn and use copycat, it uses giga drain as expected. However, when I call Z-Copycat, the move boosts Liepard's accuracy as intended -- but then the move becomes Hydro Vortex. I presume that this occurs because it copied one of the instances of surf used earlier instead of Giga Drain. This happens when Whimsicott uses other moves than giga drain as well, no matter if they're status moves or other attacks.

 

Edit: Interestingly enough, when I tried using Z-Copycat in a single battle to copy a move my liepard had used before in the same battle, I got the message "Throat Chop is not compatible with Normalium-Z" -- presumably because the game is only applying the code to transform a move into its Z-move counterpart after Copycat has called a different move and replaced itself with it.

 

Edit 2: Unfortunately, using the Darkinium-Z on Copycat when Throat Chop was the last used move returns the message "Copycat is not compatible with Darkinium-Z." If I had to guess, the move checks for both copycat's compatibility with the Z-crystal, THEN checks for the replacement move's compatibility with the Z-crystal, ensuring that Z-Copycat is currently unusable unless it's copying a normal-type move. I still have no idea why it copied surf correctly in a double battle, however.