When you use Swords dance or have the ability Huge power/Pure power does it multiply your base attack x2 or your total attack x2. I have commonly heard people say that Scizors attack becomes base 260 but I have noticed in many situation it seems that many times the base stat double is not as high as a total stat double example. Azumarill 50 attack stat becoming 100 attack stat does not raise it nearly as high as total 217 to 434. So which is it? a base stat raise or final stat raise.
The Ability Huge Power / Pure Power double the attack stat. Ie. if you have a base stat of 50, it becomes 100. Swords dance is a temporary raise, and will go away after you switch out or have it lowered. Swords dance essentially doubles your attack as well, but only temporarily.
Swords Dance: Doubles total attack.
Huge/Pure Power: Doubles the base attack stat.