It would not prevent something like the spread "damage" from Froslass. Froslass places damage counters, and damage counters are not damage, they are considered an effect of an attack. It also does not prevent Bronzong MD's Poke-Body Cursed Alloy or Spiritomb LA's Poke-Power Cursed Breath, for a few examples. Just for clarification, it does prevent Empoleon MD's attack Dual Splash when you target a Pokemon on the bench, or Starmie LS's attack Core Flash when you target a Pokemon on the bench.
