(Although this will work it does allow for a simplification of the rest of the code as you know for example that the ability will always announce at this point.)

Tested on cart and this happens if either the attacker or the target already have a Perish counter. So you just need to add a check for the target's volatiles too.

Thanks Hydrametr0nice!

What do you mean "or the target"? In the context of this ability activating there's an attacker and a defender, so I'm not sure which one (or neither?) is supposed to be the target.
In case you're referring to defender I have a video of it activating if the defender but not the attacker have the Perish status already. Is this in relation to double battles maybe?

@DaWoblefet is this a generation discrepancy?