Gotta agree with Molk here and say that Alomomola is a pain in the freaking butt to get rid off on the physical side. Its WishPassing capabilities are also pretty annoying to handle.
Liepard also ruins everything I do. Oh, my Ludicolo had just set up a Rain Dance, my opponent has low-HP Regirock, mid-HP Serperior, and Liepard, prepare to get swe-WRONG! Prankster Thunder Wave from Liepard stops that, and Parafusion hax begins
WAIT! The list doesn't end there: any fast hazard setters like Froslass or Scolipede are pretty annoying to handle, especially when you don't have a spinner because Spikes is really crazy hard to get rid off for some reason.