Outside of Battle: When a moving NPC steps in front of me, so I move in a direction to get around, and they step in front of me again! I don't know why, but this happens to me all the time.
When I'm trying to get to a special spot (ie. shaking grass, ripple, dust cloud) and I run into a wild pokemon right before I get to it.
Prior to B/W, their weren't really any of those Doctors or Nurses floating around, so I hated when I had to battle a lot, and trying to conserve what potions and etc. I had, I would keep running back to the Pokemon Center.
In Battle:The opponent always seems to hit the rare things such as confusion, critical hits and such. Mine don't.
To go with that, my pokemon act like stupid killing themselves and missing all the time. Theirs don't.
My multiple hits attacks always hit 2x, theirs 3-5x.