yeah good catch on mew. however one thing to note is that mew has a lot of options to run such as stealth rock, wisp, roost, taunt, psyshock, knock off etc. he may or may not have the slot for defog, unlike more 'dedicated' defoggers like empoleon/crobat who are pretty much running it most of the time.TM13IceBeam Don't forget mew, who is quite possibly the single best defogger in the tier atm. Also, while OU stole all good defoggers from us, pretty much every OU spinner from yestergen has come down. They were OU for a reason, look em up some time.
speaking of which, flygon is effectively an upgraded claydol that can actually do something offensive, which is cool i suppose (claydol might be preferred if you want your own hazards... haha who am i kidding claydol is fucking shit)