Punk Helmet - Trainer
Pokemon Tool

When the Active [D] Pokemon this Tool is attached to is damaged by an opponent's attack, put 4 damage counters on the Attacking Pokemon.

You may attach any number of Pokémon Tools to your Pokémon during your turn. You may attach only 1 Pokémon Tool to each Pokémon, and it stays attached.

Might be okay for grimmsnarl, except you can't attach tm devo to the active as a follow-up.

>>58092040
Gardevoir-ex wouldn't use it since it doesn't give damage for drifloon, munki, or scream tail. It's for rocket's mewtwo.

>>58092086
It's probably play percentage (>10%, 5-10%, 2-5%)