you gotta...
DO A BARRELL ROLL!!! or TRY A SOMERSAULT!! haha but on a serious note
you are right..you cant exactly prepare for them which is why wobb was considered broken last gen..Ive seen one dude pack a u-turner and voltswitcher on all his pokes and dealed with this combo great, but with a twist...He U-turned to a dusknior so counter wouldnt hit and voltswitched to a houndoom so mirror coat couldnt hit, as well as add pursuit and sucker punch to take both dugtrio and wobb..
personally im not saying everyone do that strategy but that was one ive seen work
That would force everyone to run a Dark-type, a Ghost-type, along with U-turn and Volt Switch on every Pokemon on the but those former two. If that doesn't show how broken Wobbuffet is in UU, to the point where you have to pack a specific type of move on practically every one of your Pokemon, along with a Ghost and Dark type, I don't know what will.