if you could give a mon a regional form, what would it be? bonus points for extras like dex entries / lore or typing.

I'd like a form of the mareep line in a region like sinnoh where it goes:
Mareep (ground) --> Flaafy (ground/rock) --> ampharos (ice/rock). Be something like mareep living at the base of a mountain with not that much wool, before slowly migrating north into the snow and collecting ice/rocks as its coat basically. Maybe throw something in to make it like a distant relative or mamowine, i think that'd be cool.