just fought a shiny empoleon caught in a dive ball. didn't get his battle card but i can tell from the dive ball animation. she was hit by a critical hit brick break from my kang.
not so sure for shiny salamence but i also critical hit him by metronome draco meteor after kang used mega kick. i was laughing my butt out as after double battle, none of my pokemon fainted and also done 2 serious critical hits that practically wiped the two pokemon easily.