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What makes me think Yeti Crab will be a counterpart:
Crabrawler can simply go up in the snowy mountains to train with Yeti Crab. It's description does not necessarily mean it will evolve at that location (even though it very well could). Plus a punching Pokemon with boxing gloves evolving into a blocking Pokemon with focus mitts seems off thematically.
What makes me think Yeti Crab will be a evolution:
Crabrawler can be found before the first trial, around level 10. They wouldn't introduce a decent-strong single stage Pokemon that early, unless it was Farfetch'd-tier bad or inefficient to use in game, like Audino. Ice stone also exists.
It could go either way.
Also,
>Slow defensive Ice type
