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Back when Alolan Forms were first revealed (and before we knew about yeti crab, obviously) I had the idea of Slaking migrating up to the mountaintops for whatever reason (Predators? Lack of food? Don't really know), and abandoning its lazy ways due to needing to keep its body heat up or else it will freeze to death. Here's a rough sketch.
It could have been Ice/Fighting, and since it wouldn't have Truant, it could have maybe had a stat rebalancing. Or Defeatist.