I used downgrading beam in two matches and it didn't work. It lets you select the evolved pokémon, but it doesn't remove any evolution cards. Is this because they were ex Pokémon?
It's been broken for a while. Since it's not a good card, don't expect a fix anytime soon.
Hello Trainer Partridge001 ,
Thank you for your report. I recommend you open a ticket for this issue with the support team. To do so, visit support.pokemon.com then click the Pokémon Trading Card Game Live link. From there click "Contact Us".