The Puzzle of Nebula Gate

[Banette]

On the northern, southern, eastern,and western sides of the dome, there's some sort of writing that appears to be written in fading ink. The main instruction written is " To the pure who seek refuge, to the friend of the Pokemon, seek with the fourth thy heart". Hm. What would that mean?

Northern;

A few paces away from here, there are two grey boulders and two blue rocks, going from large to small, large to small. The riddle reads;

Four stones, twin stones...
Master of Shadow and Dark...
Two are one, one is two...


Southern;

A few paces from here, there are two blue boulders and two grey rocks, going from small to large, to small to large.The riddle once reads;

Four stones, twin stones...
Can Live Again by the Stone...
Two are one, one is two...


Western;

Here there's but the sky, the wall, and the ground. Absolutely nothing else. Though the riddle makes a bit of sense of this... or not.

The unseen may yet be felt...
So That They, the Great Ones...
Be it here? Be it there?


Eastern;

Once again, a giant bolder sits in the way. The riddle reads;

Straight on, straight onward...
We Know the Moon Spurns Us...
Destroy all in your path...

...

Hm. What could it all mean?