Shadow pokémon – bulbapedia, the community-driven pokémon encyclopedia electricity schoolhouse rock

Shadow Pokémon are created through an undisclosed process that removes the Pokémon’s emotions, turning it into a soulless fighting machine. Ein, creator of the process and Cipher’s head scientist at the time of Colosseum, refers to this process as "shutting the door to their hearts". In XD, Cipher’s science division refines and upgrades the process, allowing many Shadow Pokémon to be produced simultaneously. The head of the science division, Cipher Admin Lovrina, also works on stabilizing the process to increase resistance to purification; her ultimate goal is to create a Shadow Pokémon that is completely impossible to purify.

While normal Pokémon are generally friendly and trusting creatures, Shadow Pokémon are not hesitant to attack with full force, using Shadow moves, such as Shadow Rush. Likewise, they do not attack only other Pokémon, and will actually attack Trainers. Shadow Pokémon can sometimes be overwhelmed by their emotions, indicating the relative instability of their Shadow state, and will sometimes enter a state known as Hyper Mode in Colosseum and Reverse Mode in XD. This state will be triggered more often the closer the Pokémon is to purification, making them generally more difficult to battle with until they are ultimately purified. A Pokémon in this state can be cured of it by calling to it in battle or use of a scent, as well as several other methods, or can recover on its own.

An interesting quirk about Shadow Pokémon is their inability to be differentiated from normal Pokémon by all but those with certain abilities or tools. Shadow Pokémon emit a normally invisible dark aura that normal Pokémon do not, which so far has only been able to be detected by Rui through an innate ability, and Michael with his Aura Reader. The only exception is Shadow Lugia, which takes on noticeable alterations, namely having jagged silver eyefins and possessing an overall darker complexion.

Strangely enough, a Shadow Pokémon that isn’t under the care of the player will not enter Hyper Mode / Reverse Mode or apparently reduce its Heart Gauge, although a Shadow Pokémon the player controls will purify itself just by being in the Trainer’s party.

An important difference between Colosseum and XD is the number of Shadow Pokémon each Cipher member carries: in Colosseum, each NPC Trainer only carries one at a time; in XD there are many Trainers with two or more Shadow Pokémon in their team, the first one being encountered at the Cipher Key Lair, and the final boss of the game has seven Shadow Pokémon under his care. This may be a result of the large number of Shadow Pokémon in XD.

A Shadow Pokémon‘s purification process will begin as soon as it has been snagged, which is directly indicated by its Heart Gauge. Replacing the experience bar, the Heart Gauge monitors how close the Pokémon is to being fully purified, with the dark purple fill gradually depleting.

A Shadow Pokémon, when encountered, is generated in the same way that a wild Pokémon is generated in the Generation III games, with its personality value and individual values generated together and no effort values. Shadow Pokémon don’t have a set Nature or a set gender, but once encountered, the personality value, Nature and IVs are saved to the memory for the Shadow Monitor to be able to keep track of their exact status and location. This means that once a Shadow Pokémon is encountered for the first time, its Nature, IVs and gender will remain the same for the rest of the game, even if the player fails to capture it or is forced to re-battle it later.

In Pokémon Colosseum, like in the main series games, there is a 1/8192 chance of a Shadow Pokémon being Shiny; however, when a Shiny Shadow Pokémon is captured, it is highly improbable that the Pokémon will retain Shininess. Conversely, when an ordinary Shadow Pokémon is captured, there is still the 1/8192 chance of that Pokémon becoming Shiny when it is sent to the player’s party or the Pokémon Storage System. Shininess is retained through purification.

However, in Pokémon XD, this glitch was corrected. When the game calculates a personality value, it checks against the player’s ID numbers and the opponent’s ID numbers. If the game were to generate a Shiny personality value, it would then recalculate the personality value until it would not be Shiny with either the player’s or the opponent’s ID numbers. As a consequence of fixing this glitch from Pokémon Colosseum in Pokémon XD, the game ensures that all Shadow Pokémon are never Shiny. This defeats the still-popular rumor that Shadow Pokémon can be shiny after purification; all of these values are determined when they are encountered for the first time and are not linked to purification in any way.