The set up required for this isn't that bad. However, what makes it better than Shell Smash and Focus Band Icicle Spear? I see this good on a hail team, where you switch out into Hail and give it Choice Band, save Ice Rock/Never-Melt-Ice for another member. Problems I see are: Weather teams aren't great, unless you're playing mono-type, having all members a common type isn't great (and, even if you are mono-type, I'm not sure if weather is reliable in that meta, either).
The Shell Smash Cloyster is better, mostly because it has way more speed and is way more reliable. It's not bad, and could be pretty good on mono-type/in-game team, but it isn't great in the RU, UU, OU, or Ubers meta.
(The main formats that it is used in, and I'm also sure weather isn't great in VGC 18)