purification chamber

[rukario42]

hows do you use it , its so difficult, what do you do?

 

[trjessie579]

Serebii has a whole page on it:

https://www.serebii.net/xd/hall.shtml

Basically you put your Shadow Pokemon in the middle, and put four purified Pokemon around it. As you walk around, your Shadow Pokemon will gradually begin to purify.

It purifies faster if you put the Pokemon in a specific order, which is elaborated on in the link I gave.