It's usually one of my last pokes standing, I initially went with tailwind too but it doesn't really make good use of it.
Wide guard makes it immune to rock slide's and discharges for a turn and supports your partner.. icy wind whilst your partner protects against faster mons is approximately as reliable as cresselia and just like cresselia it has helping hand. Let's not forget it resists heat wave, is immune to surf and EQ and takes a pittance from the majority of sludge wave users.
Combination of icy wind, wide guard and helping hand is enough for me. The main reason to use it over cress if you use it at all is wide guard + water absorb, basically makes it a better rain counter and a reliable support mon that is simply not quite as bulky. I guess when stealth rock catches on it's viability will shoot down.
Also BlankZero, I was trying to say Archeops is more viable then you give it credit for, not that it is good with a focus sash (lol). Although it's ability doesn't reduce its speed under 50% so you can try something gimmicky like endeavour if you really want to sash it. I've used sash aerodactyl as well and they play two different roles, aerodactyl doesn't have archeops KO potential whilst archeops doesn't have aerodactyl's unique speed/movepool/ability combination. Ofcourse this could all change the moment Aerodactyl gets a stab recoil move or Archeops gets a new ability.
I'm not saying Archeops isn't a threat at all, but once it gets to 50% it's deadweight on the team.