While it’s obvious this is based on the Pokemon games, Spear Pillar is an area where the legendary pokemon are in the Diamond/Pearl games. It’s very 2D and plain in the actual games, so this looks far grander in the 3D graphics. I’ve liked the stage since Brawl on Wii.
There are two levels to the stage, but what to look out for are the legendary Pokemon that will change the way things work. Cresselia will send powerful blades of energy your way. The pokemon doesn’t care who gets hit.
Dialga will mess with time, and generally you can overcome this hazard.
Palkia doesn’t play around. He can flip the stage upside down and around. Making it very difficult to figure out what you’re doing until the affect wears off. I generally hate it when he shows up though.