So, I'm playing in the Battle Arcade on Soulsilver. My team is Girafarig, Lucario, and Sceptile. My opponents are Nidoking, Flygon, and Hariyama. No items on either side. The event is that the opponent is put to sleep. So why is it that Nidoking falls asleep but the other two don't? Anyone got an answer for me?

That particular event only puts one Pokémon to sleep, not the entire team; same thing with the freeze event.