Alolan Muk will be a nice hard counter against Alakazm I think.There should be a fair number of steel types I presume.
Also, don't forget Alolan Rattata and Meowth are both dark types. Also, there's enough part poison types to scare off what few fairies there are. Remember that every grass type, and almost every bug type, in gen 1 was part poison.
I imagine Alakazam and Gengar will be huge threats in the meta unless bug and dark moves get passed around quite a bit. The sheer speed, SpA, and movepool will make them both pretty dangerous.