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Trainer ID number (view source)

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[[File:USUM status screen.png|thumb|This {{p|Pikipek}}'s Trainer's ID number is '''291177'''.]]
[[File:USUM status screen.png|thumb|This {{p|Pikipek}}'s Trainer's ID number is '''291177'''.]]
A [[Pokémon Trainer]]'s '''ID number''' (Japanese: '''IDNo.''') is a number that is assigned to a Trainer when they begin their Pokémon journey. It is shown in the Pokémon's [[summary]]. It is used, in conjunction with the [[Original Trainer|Trainer's name]] and gender, to identify whether the Pokémon is an [[outsider Pokémon]] by the {{pkmn|games}}.
A [[Pokémon Trainer]]'s '''ID number''' (Japanese: '''IDNo.''') is a [[Pseudorandom number generation in Pokémon|randomly generated]] number that is assigned to a player when they create a new save file. Any Pokémon that this Trainer obtains have the number shown in their [[summary]]; it is used, in conjunction with the [[Original Trainer|Trainer's name]] and [[gender]], to identify whether the Pokémon is an [[outsider Pokémon]]. The ID numbers of a player's Pokémon are also used in the [[Pokémon Lottery Corner|Loto-ID]] to determine whether they will win a prize, and if so which prize they will win. Finally, starting in [[Generation III]], whether a Pokémon is {{Shiny}} is determined by a formula that takes into consideration their ID number and [[personality value]].


The smallest possible Trainer ID number is 0. Prior to [[Generation VII]], it is capped at {{wp|65535 (number)|65535}}. Starting from Generation VII, it is capped at 999999.
The smallest possible Trainer ID number is 0. Prior to [[Generation VII]], the largest was {{wp|65535 (number)|65535}}; starting in Generation VII, it is instead 999999.


==Special ID numbers==
{{pkmn|Egg}}s use ????? (prior to Generation VII) or ?????? (from Generation VII onwards) as their ID number until they are hatched. [[Purification|Unpurified]] [[Shadow Pokémon]] also use ????? as their ID number until they are purified, at which point the number changes to that of the Trainer who [[Snagging|snagged]] the Pokémon.
{{main|List of notable ID numbers}}
Sometimes, there are special ID numbers assigned to Pokémon if they come from a non-standard Pokémon game or are received as a prize. Also, for Pokémon not yet hatched from their {{pkmn|Egg}}s, the ID ????? is used. It will turn into the ID number of the Trainer who hatches the Pokémon. It is also used for [[Purification|unpurified]] [[Shadow Pokémon]]. Once purified, the ID number will change to that of the Trainer who [[Snagging|snagged]] it.


==Secret ID==
==Secret ID==
From [[Generation III]] onward, there is a second, secret ID number, different from the visible one. This number exists purely to make sure that even if two Trainers share the exact same name and gender and the exact same Trainer ID number, the game will still recognize their Pokémon as coming from different Trainers. Usually, this number cannot be viewed; however, certain [[Cheating|cheating devices]] can be used to view it, and there are also calculators to determine it. It also comes into play along with the normal ID number and the [[personality value]] in determining if a Pokémon is {{Shiny}}. If two different Trainers have the same [[Original Trainer|Trainer name]], identical ID numbers and identical hidden ID numbers (a 1 in 4,294,967,296 chance if the names do not differ), the game will recognize the two Trainers as the same, so the Pokémon are not considered to be [[outsider Pokémon]].
From [[Generation III]] onward, in addition to their regular ID numbers, Trainers and Pokémon are also assigned a second, unseen ID number different from the visible one. This number exists to reduce the chances of the games erroneously identifying a Pokémon from another Trainer as not being an [[outsider Pokémon]], since even if two Trainers share the exact same name, gender and Trainer ID number, the game will still recognize their Pokémon as coming from different Trainers should their secret ID numbers be different. A Pokémon's secret ID number is also used along with its main ID number and [[personality value]] in determining if it is {{Shiny}}. Although a secret ID number cannot be viewed without [[Cheating|cheating devices]], it is possible to calculate it. If two different Trainers have the same [[Original Trainer|Trainer name]] and gender, as well as identical ID numbers and secret ID numbers (a 1 in 4,294,967,296 chance), the games will recognize the two Trainers as the same, and so will not consider their Pokémon to be [[outsider Pokémon]].


Secret IDs from Pokémon obtained prior to [[Generation VII]] are five digits long; those from Pokémon obtained in Generation VII are four digits long. Pokémon transferred to Generation VII from the [[Virtual Console]] releases of Generations {{Gen|I}} and {{Gen|II}} are given a Secret ID of 00000.
Secret IDs from Pokémon obtained prior to [[Generation VII]] are five digits long; those from Pokémon obtained in Generation VII onwards are four digits long. Pokémon transferred to Generation VII from the [[Virtual Console]] releases of Generations {{Gen|I}} and {{Gen|II}} are given a Secret ID of 00000.


==Generation VII==
==Alterations in Generation VII==
From [[Generation VII]] onward, the ID number is a six-digit number. A five-digit Trainer ID and a five-digit Secret ID are still generated but are not displayed on the {{ga|Trainer Card}} directly. Rather, they are used to calculate the final ID number by using the following formula: <code>ID<sub>final</sub> = ID<sub>trainer</sub> + (ID<sub>secret</sub> × 65536)</code>. The last six digits of the resulting number are what is displayed when the Trainer Card is viewed.
From [[Generation VII]] onward, the ID number is a six-digit number, rather than a five-digit number as it previously was. A five-digit Trainer ID and a five-digit secret ID are still generated, but are then used to calculate the final ID number by using the following formula: <code>ID<sub>final</sub> = ID<sub>trainer</sub> + (ID<sub>secret</sub> × 65536)</code>. The last six digits of the resulting number are used as the ID number.


For example, consider a new save file in which the player's assigned Trainer ID and Secret ID are 00033 and 34262, respectively. The final ID number will be 33 + (34262*65536) = 2245394465. However, only the last six digits are used so the Trainer Card will display an ID No. of 394465.
For example, consider a new save file in which the player's assigned Trainer ID and Secret ID are 00033 and 34262, respectively. The final ID number will be 33 + (34262*65536) = 2245394465. However, only the last six digits are used so the Trainer Card will display an ID No. of 394465.
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If a Pokémon is transferred to Generation VII from a previous generation, its Trainer's ID number will remain 5 digits long.
If a Pokémon is transferred to Generation VII from a previous generation, its Trainer's ID number will remain 5 digits long.


==Pokémon Lottery Corner==
==Special ID numbers==
{{main|List of notable ID numbers}}
In most cases, Pokémon received from [[in-game trade]]s, [[Event Pokémon|events]], or other such special conditions have a predetermined ID number.
 
==Loto-ID==
{{main|Pokémon Lottery Corner}}
{{main|Pokémon Lottery Corner}}
Once per week in [[Generation II]] and once per day in Generations {{gen|III}}, {{gen|IV}}, {{gen|VI}}, {{gen|VII}}, and {{gen|VIII}}, the player may take part in the Pokémon Lottery Corner. This involves the generation of a random 5 digit number, which is compared with the player's Pokémon's [[original Trainer]]'s ID numbers. Depending on the game and the nature of the match-up of digits, the player can receive a prize. This feature was not included in the [[Generation V]] games, but returned in the {{pkmn|X and Y}} games as the Loto-ID in [[Lumiose City]].
Once per week in [[Generation II]] and once per day in Generations {{gen|III}}, {{gen|IV}}, {{gen|VI}}, {{gen|VII}}, and {{gen|VIII}}, the player may take part in the Pokémon Lottery Corner. This involves the generation of a random 5 digit number, which is compared with the player's Pokémon's [[original Trainer]]'s ID numbers. Depending on the game and the nature of the match-up of digits, the player can receive a prize. This feature was not included in the [[Generation V]] games, but returned in the {{pkmn|X and Y}} games as the Loto-ID in [[Lumiose City]].
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