Making a transformed Ditto keep its own shininess

I'm trying to make it so that Ditto can Transform but keeps his own Shininess rather than the target's. I have it so that right before the Transformation animation, I copy the target to a variable named "bob", using
then I edit bob's shininess to match Ditto's. This, however, seems to cause the target to become Shiny - the infobox gains the red star but the sprite doesn't change.

Edit: I made a small fix and now the only issue is that the target becomes Shiny when it shouldn't be.

Second Edit: I have a fix. before making the variable bob I store the shininess to a new value (but I use (opponent.isShiny?)==true so it stores as a boolien instead of a function), and after the transformation I revert opponent's shininess to that value.