I love it when people don't understand how Slow Start works. If you use Skill Swap within the first 5 turns, your stats will be permanently reduced until you switch. Then, when you switch back in, you will have Slow Start again. Skill Swap doesn't help Regigigas. It also doesn't hurt your opponent, because it activates on the switch, so they wouldn't be affected by it.
"Power of mind is infinite, while brawn is limited." Koichi Tohei Official Chespin of the Pokemon X board.