giovanni doesn't bust 0 damage attack

lore24r

today i found out that if you use Giovanni and then use a coinflip attack and you roll all tails the attack will do 0 and not 10, i don't know if it's a bug or a ""feature"". I think that when the attack stay "if you lose the coinflip the attack is nullify" it should do 0 and giovanni should not applay, but in case of zapdos and kangaskhan if you roll all tails the attack should do 10

DoubleCure

Giovanni’s effect adds +10 damage to your Pokemon’s attack damage. If your attack does no damage Giovanni’s effect it's not activated.

Same applies to attacks like Cubone "Growl" attack, Giovanni will not be activated because the attack does no damage.