Ok, this attack is very confusing. Here is what the text says
{C}{C}{C} Dogpile Count the number of Pokemon on your Bench. This attack does 10 times that number of damage to the Defending Pokemon, and Chansey does 10 times that number of damage to itself.
So if you have 3 benched pokemon (for example), what is the story with this:
A. 30 damage to the Defending Pokemon, and 300 damage to your Chansey
B. 30 damage to the Defending Pokemon, and 30 damage to your Chansey
{C}{C}{C} Dogpile Count the number of Pokemon on your Bench. This attack does 10 times that number of damage to the Defending Pokemon, and Chansey does 10 times that number of damage to itself.
So if you have 3 benched pokemon (for example), what is the story with this:
A. 30 damage to the Defending Pokemon, and 300 damage to your Chansey
B. 30 damage to the Defending Pokemon, and 30 damage to your Chansey