About your Dream Radar question. I was fighting Thundurus, and Thundurus seemed to be harder this time with him hanging on my ceiling, very hard to find, and throwing out thunderbolts out of nowhere. When I lost that battle, I still had enough orbs to fight Tornadus, and Tornadus seemed harder to fight this time (but at least he wasn't doing the cheap "I'm on your ceiling trick"), when I beat Tornadus, I actually got a Life Orb that time. I can't say for sure that they will become more difficult for those unique items that they don't all share (Star PIece, Heart Scale, Rare Candy), but I have a creeping suspicion.