Geobuster

usually, when this happens in the wild without human intervention, it just means that the pressures to evolve were overwhelmed by pressures against evolution. but wyrdeer is kind of an interesting case! while they do have that luxurious fur, global warming is no the reason they stopped evolving.

wyrdeer were extremely rare in the wild even during hisuian times, because their evolutionary requirements are so specific. what caused their evolution was not living in a cold climate but rather exposure to a very specific type of psychic type energy caused by using the move psyshield bash in a specific way. the fur growth resulting in that warm beard is a side effect of the energy, which is something we see in other pokemon that store energy in their fur or feathers. only the strongest, most agile stantler were capable of triggering evolution in the wild, which is why wyrdeer generally were seen leading their herds.

as for why the evolution died out...part of it is because it just wasn't a common evolution. wild stantler can survive just fine without a wyrdeer leading them. the other part is that, as populations of stantler were brought to sinnoh from johto and began breeding with sinnohan populations, there was a shift in moves learned by the resulting offspring. move atrophy happens more commonly than you might think! over time, psyshield bash dropped from the native moveset. the resulting population therefore lost the means they needed to evolve, but because stantler survive super well on their own, it didn't really affect them.

This is what I drew after this situation 👇

This represents a fundamental misunderstanding of Mario's central plot structure. Mario always gets his ass beat in his initial encounter with an outside context problem, then spends the bulk of the game going around gathering allies and kicking the legs out from under the outside context problem's support structure.

"I don't think Kirby gets paid for this."

"That's-a not what I said."