Gastro Acid also accomplishes this, does it not? This allows you to run an Eelektross instead of a Whimsicott, allowing you to *also* throw in Thunder Wave to block out Poison and Burn. Also, you really can't afford to give up Safety Goggles on Shedinja to protect it from weather and powder. Under these conditions, as long as Shedinja survives the 1 turn required, the only ways to deal with it would be to Thief, Knock-off, Switcheroo, or Magician the Safety Goggles off Shedinja during weather. Right?