Whenever a Crabrawler thinks itself strong enough, it ascends Mount Lanakila, hoping to test itself in a place famed for some of the strongest wild pokemon in Alola. Given the density of ice and dark pokemon on the mountain's slopes, the battles are a test which the fighting-type Crabrawler typically pass; the many avalanches and steep slopes pose a much harder challenge. But Crabrawler are pokemon with far too much pride and determination to let themselves be defeated by nature; while Crabrawler climb the icy mountain, it is Crabominable that descend it.
Crabrawler do not evolve out of desire, but necessity; once they get trapped in avalanches or freeze in the cold, they must grow larger and icier to survive. Crabominable treat their evolution like a power-up necessary to defeat the mountain – more of a held item than a new form – and are often surprised, once they spot their reflection in a smooth wall of mountain ice, by just how much their bodies have changed. Crabominable view Mount Lanakila as something like another pokemon, an enemy which defeated them, so they climb higher and higher towards the summit, confronting natural obstacles and pokemon alike along the way. It is not a coincidence that Alola's Pokemon League was placed atop Mount Lanalika, for the journeys of the Crabominable inspired many generations of pokemon trainers; it felt only natural to give humans an equal challenge, and Crabominable something beyond pride to climb for.
A Crabominable's journey up Mount Lanakila can take many years, although their distorted sense of time from evolution and constant battles prevent them from realizing just how much time has passed. Indeed, before the Alolan League was built, only the lights of Ula'ula island told successful Crabominable that humanity still existed at all.