If the rain team somehow knows Abomasnow is Scarfed then it's not a difficult matter to switch out and wear it down. Without Leftovers, being weak to SR and the fact that every rain sweeper can slam Abomasnow hard (Kingdra can Draco Meteor, Omastar can Ice Beam / HP Rock, Ludicolo can Focus Punch, Kabutops can Stone Edge ...) Abomasnow can't really come in except after a KO. Yes Hitmontop and Donphan can spin, but the price is that rain gets to set up. Depending on which supporter rain is using it could mean not just rain going up, it might also mean screens, Memento, etc. So although hail is a tough barrier to a rain sweep, I'm not convinced rain is at a disadvantage.
Also Chansey is easily 2HKOed by Gorebyss's +2 Aqua Tail in the rain, while ChestoRest Kingdra can Dragon Dance on it without fear. Team preview does a whole lot - if you see Chansey on the other team, then you don't initiate a sweep with a sweeper like Ludicolo.
Nonetheless I admit I am theorycrafting. Ultimately the only real way to tell for sure is to play rain myself or play against it, and since nobody is playing rain right now I'll have to play rain myself. Let's see what happens ...
Also Chansey is easily 2HKOed by Gorebyss's +2 Aqua Tail in the rain, while ChestoRest Kingdra can Dragon Dance on it without fear. Team preview does a whole lot - if you see Chansey on the other team, then you don't initiate a sweep with a sweeper like Ludicolo.
Nonetheless I admit I am theorycrafting. Ultimately the only real way to tell for sure is to play rain myself or play against it, and since nobody is playing rain right now I'll have to play rain myself. Let's see what happens ...