Walkthrough: Getting to the Pokemon League is actually pretty simple, since Mount Lanakila is an empty trainer with no trainers, However, there are plenty of different levels to this highest peak in all of Alola. This is also the area where Crabrawler will evolve when leveled-up, where the Ice Rock can be found to evolve Eevee into Glaceon, and where the Move Reminder calls home (Pokemon Center At Peak).
Wild Pokemon:
Initial Pokemon (Levels 45-48): Snorunt(30%), Vulpix(30%), Sneasel(20%), Absol(20%)
SOS Pokemon #1 (Levels 45-48): Glalie, Vulpix, Sneasel, Absol
Weather Battle (Levels 42-45): Castform, Castform, Vanillish, Castform
Initial Pokemon (Levels 45-48): Snorunt(30%), Golbat(30%), Sneasel(20%), Absol(20%)
SOS Pokemon #1 (Levels 45-48): Glalie, Golbat, Sneasel, Absol
Initial Pokemon (Levels 42-45): Snorunt(30%), Vulpix(30%), Sneasel(20%), Absol(20%)
SOS Pokemon #1 (Levels 42-45): Glalie, Vulpix, Sneasel, Absol
Weather Battle (Levels 42-45): Castform, Castform, Vanillish, Castform
Zygarde: There are two Zygarde Cells found scattered throughout the entire Mountain.
Items:
Escape Rope - Mountainside
Icium Z - Cave
Full Restore - Cave
TM13 (Ice Beam) - Cave
Max Revive - Mid-Point
PP Max - Peak