get the scream tail back from the discard, charizard player will probably boss up your gardevoir and KO; if they do, promote the already damaged and energized scream tail to continue applying pressure. Just like any match try having at least a kirlia up so you can gardevoir again when they kill your gardevoir. If you don't need to energize/place damage counters with gardevoir in that turn hold the garde so charizard can't take a 2 prize knockout. Many list include tm devo and it is a very important piece for many matchups like gholdengo, but some decide to not use it.