Ok, I'll lengthen the bio.
I can kinda see where you're coming from with the whole 'no damage' thing, 'cause in the PMD games moves that would normally do no damage (EX: Hyper Beam on a Gengar) instead do 1/8th of their normal damage. I... for some reason, prefer immunity. Maybe it's because I'm still mad at the anime for ignoring similar type matchups just so pikachu can win, or maybe it's just because I prefer using the main series games as a resource for this.