I know it seems straightforward, but I tried searching sites and this forum but found nothing to collaborate with despite it sounding like a common occurence. If an attack deals damage and has an effect, for example "20 damage and poisons" but a card effect makes the damage 0 such as hard charm, the attack does 0 damage. Does the additional effect (poison in this case) still apply or does the attack fail having done no damage? The specific instance this happened was with "Mew EX"(dragons exalted), equipped with "Jamming net" copying Qwilfish's (Flashfire) poison sting. Poison sting dealt 20 - 20 = 0 damage but has the effect "the defending pokemon is now poisoned". Players disputed whether the poison kicked in. Summary: Does an attack that causes damage with an additional effect have to cause some damage for the effect to kick in? On the spot, it was decided the attack had "succeeded", it just didnt do damage. As it "succeeded", the poison kicked in.