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It fills a specific niche in UU against the numerous Water types and Scald users, mainly CROcune and Milotic.
It's the same reason Tangrowth suddenly jumped all the way to OU. Sometimes a mon can perform better in a higher tier, or vice versa. Something can hold a minor niche in one tier, get dropped, and now is countered by things that are common in its new tier that were not as common in its old one.
