This area is shaped like a Xurkitree with lots of Xurkitree in the background. As you walk through the area, lightning will strike repeatedly around all elements of the planet. When you reach the top, you'll find another Xurkitree, which will get hit by lightning at attack.

Non-Alolan Evolution
If you evolve your Pikachu, Exeggcute or Cubone here, they will evolve into the Kantonian forms