Blunder Policy doesn't look like it is frequently used, but it is really good on Dracozolt, and Dracozolt got 14% used rate last month, so is it Viable in VGC or not. I am specifically talking about battle stadium doubles.
Not really, no.
Blunder Policy requires an inaccurate move, and those often aren’t very good. Pokémon could just boost their speed with Agility, Max Airstream, or a Choice Scarf. You are better off just running a Life Orb or a Choice Scarf or something that’s better.