Like I said before, use Swanna for good Defog support!
Swanna @ Leftovers/Life Orb
Ability: Hydration
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Hurricane/Air Slash/Ice Beam
- Scald
- Defog
- Roost
It is, without a doubt, the best offensive Defogger in the tier now, being fairly quick at 98 speed, having reliable recovery and being immune to Sticky Web and Spikes. Defiant Pokemon can't really switch into Swanna safely since Scald can burn Pawniard and Primeape is OHKOed by Hurricane or Air Slash. Water/Flying and Water/Ice is pretty good coverage with only two moves as well. Also very good on or facing rain teams. Definitely a very underrated NU Pokemon. Don't know how this only has less than 2% usage.
Yeah I think Swanna is the only offensive Defogger in the tier right now, so being the best isn't too difficult :P Haven't used it myself but they say Swanna is pretty good. It's got good offensive presence which is very helpful for Defogging safely. It also matches up well against common hazard setters like Rhydon, Seismitoad who can't really touch you, Qwilfish almost gets oneshotted by Hurricane etc. Go Swanna!