Purification Chamber
From Bulbapedia, the community-driven Pokémon encyclopedia.
The Purification Chamber (Japanese: リライブホール Relive Hall) is a series of nine sub-chambers located in the Pokémon HQ Lab, developed by Michael's father and Professor Krane to make purification faster just in case Cipher would ever return.
A sub-chamber operates via the elemental types of the Pokémon in it. That is, the effectiveness of the purification sub-chamber depends on what the types that the Pokémon inside do to the other Pokémon inside. Whether the type has no effect (Ground on Flying), a weak effect (Fire on itself), a normal effect (Normal on Grass), or a strong effect (Dark on Psychic) determines whether the flow is very weak, weak, normal, or strong, respectively. The effectiveness can be against either of the Pokémon's types, and stem from either type. For the purposes of the Purification Chamber, it is assumed that Normal is strong against itself.
The chamber works by slowly opening a Pokémon's heart with time. The higher the tempo and flow in a chamber, the faster the purification proceeds. This works for all shadow Pokémon except Lugia. Lugia must be placed into a chamber where all nine chambers are at the maximum tempo. Lugia will then have its Heart Gauge opened, however its heart will fully close again if it is removed from the chamber or the tempo of any chamber is reduced from being at the maximum. Due to this, the purification chamber is the only way to open Lugia's heart.
Example setup
A sample setup of a sub-chamber that has strong flow all around would be as follows:
| → |  Murkrow Dark Flying | ↓ |
 Lanturn Water Electric |  Shadow Snorunt Ice ↓ |  Abra Psychic |
| ↑ |  Bulbasaur Grass Poison | ← |
