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It's pretty much anything goes since the weather nerf. I mean, the new terrain moves last just as long and usually have dual benefits, like Misty Terrain blocks status effects and cuts Dragon Attacks in half. Hail could probably get away with getting two buffs, too, given how shitty most ice types are. There's lots of possibilities, like boosting a specific stat for Ice types, eliminating one of Ice's weakness (Maybe rock?), or having Hails chip damage hit for more on ttypes weak to ice (Basically the Stealth Rock of weather).
