x2Drag OffBefore doing damage, you may choose 1 of your opponent's Benched Pokémon and switch it with 1 of the Defending Pokémon. Your opponent chooses the Defending Pokémon to switch.
Burn AwayBefore doing damage, count the remaining HP of the Defending Pokémon. If that Pokémon is Knocked Out by this attack, Blaziken ex does damage to itself equal to the attack's damage minus the remaining HP of the Defending Pokémon. This attack's damage isn't by Weakness, Resistance, Poké-Powers, Poké-Bodies, or any other effects on that Pokémon.
When Pokémon-ex has been Knocked Out, your opponent takes 2 Prize cards.
If I use Primeape's "Drag Off" attack and choose my opponent's benched Misty's Magikarp with "So Submerged" Ability, would it do 30 damage to their Active Pokemon?
No, damage is only done to the "new Active Pokemon". The damage doesn't happen because So Submerged prevents Drag Off from bringing Misty's Magikarp into the Active Spot.
If my opponent has no benched Pokemon, do I do 40 damage to their Active Pokemon when I use Braviary's "Drag Off" attack?
No. Damage is only done to the "new Active Pokemon". If there is no switch, then no damage is done.
If my opponent has no benched Pokemon, do I do 50 damage to their active Pokemon when I use Nidoking's "Drag Off" attack?
No. Damage is only done to the "new Active Pokemon". If there is no switch, then no damage is done.