The usual when your doing pretty good and then you start getting haxed like crazy. I've started seeing jirachi make a comeback on teams which is freaking annoying using Iron Head to flinch or Body Slam to paralyze. Also how many rain teams their are or weather teams in general (mostly rain). I feel there should be a tier just for weather just so I don't have to fight 100 different weather based teams everyday.
Clear skies is the tier for you!