Doing everything from a competitive POV except the first one, deal w/ it. All these I've either used or faced, and find them awesome because they're annoying.
Normal - Herdier
I love it. <333 Also, Audino is also normal ;3
Fire - Infernape
As a lead, Infernape is awesome - w/ sash, vacuum wave for priority, U-turn for safety, Overheat for STAB power and CC for awesomeness, it works pretty well. In my team it generally survived to the end.
Fighting - Conkeldurr and/or Breloom
Conkeldurr is annoying to face, though easy to OHKO too with the right Pokemon. :x Breloom, however, is crazy annoying. Spore/Sub/Focus Punch/Grass attack... yeaaah it's an annoying combination and Poison Heal doesn't make it any less annoying. Faster/priority ftw!
Water - Politoed
Probably the most common water Pokemon rn with rain stall. Crazy annoying (therefore good!), but can usually be 2HKO'd, just need to watch for Toxic/Perish Song.
Flying - Gyarados
Restalk, general sweeper, etc, it is awesome.
Grass - Whimisicott
The trolliest Pokemon ever. Prankster giving status instant priority, leech seed, giga drain (or other attack), encore and substitute w/ big root. Faced it once and got annoyed, used it myself and thought "amazing!"
Poison - Gengar
I don't use it for the fact that it's poison, rather that it's fast and with LO can OHKO many w/ shadow ball.
Electric - Rotom-W
Omg, so annoying to face with the Scizor combination. It's fun to use though, Pain Split, Volt Switch, yup, awesome.
Ground - Gliscor
I love Gliscor so much. Poison Heal, omg so many possibilities. Taunt, Sub, Poison, probably the most annoying is a combination of the three, though I ran Taunt/SD w/ mine.
Psychic - Jirachi
Jirachi is amazing. Iron Head w/ Serene Grace, flinch hax yees, and CM/Sub/Psyshock, totally annoying but awesome. Haven't seen many others use that Jirachi, though.
Ice - Cloyster
Sash and ice shard and shell smash and skill link ugh so awesome.
Bug - Volcarona
QD. Fiery Dance. Bug Buzz. Oh yeeeeees. Mine's sash'd, though, and when Scizor arrived I switch to safety. :x
Dragon - Dragonite and/or Haxorus
Multiscale. Multiscale. Multiscale. SR kills that off though, and iirc Haxorus hits harder in general (love using Haxorus).
Rock - Terrakion
I love Terrakion, no harm from sand, can hit hard and is fast :3
Ghost - Jellicent
That SPd, that recovery, that toxic, that... yeaah.
Dark - Tyranitar
SS. I think I'm mainly listing it because I love OHKOing it.
Steel - Scizor
...so...annoying. w/ Bullet Punch and Technician it's almost impossible to get it to go away. On the plus side, switch in Volcarona to Rotom-W, use fire attack and boom, expected Scizor dead!
Either way these are my favourites. :3