Any Snorlax with Whirlwind almost certainly has Sleep Talk, so its odds go back up to normal, but Snorlax can just paralyze Venomoth directly anyway.
Phazers aren't even the best way to deal with Venomoth - a Choice Scarfer is, or any strong attacker with reasonable Special Defense. Wonder Skin is wonderful but people are REALLY freaking out about it when they just don't need to.
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