Annoyer's are Pokemon, with it's basic role, to annoy.
Annoyer's are basically walls, but not really.
They usually inflict status's to try and prevent the opponent from doing anything, like these combos:
Confuse Ray and Paralysis
Protect and various other moves and so on and so forth.
This usually allows the user with the annoyer to set up or do whatever it is they please.
Some could include flinching moves, or for stalling for hax.
Annoyers are what they sound like: annoying.
Hope this helps! ~