Copycat always fails

[Former user]

I caught a Bonsly at the beginning of the game using a Randomizer challenge and whenever it uses Copycat, it fails. I looked up the conditions for Copycat failing on Bulbapedia and it didn't match. It appears to be happening for no reason.

[Joey Mallon]

Yes, i encountered the same issue with my Riolu

[Trent]

I'm having the same here in a normal game.