That is your trainer's ID number.
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The secret ID is a number that identifies you and all of your Pokemon, but it is not the number you can check on your trainer's card or on ony of your pokemons sumaries. The secret ID can be Found in several ways, It is used for RNG (Random Number Generator) Abuse, which, if done correctly, can help you easily obtain shiny and "perfect" Pokemon. If you have a shiny Pokemon captured in the wild (without chaining from the pokeradar, or obtaining it from an egg), then you can also calculate your SID
the ID number on your ID card
The ID number is 383
The ID number is the original trainer's ID, the person who caught or hatched the Pokémon.
The ID number of any Pokemon is given to it by the trainer - namely, you. Your ID number is given to every Pokemon you own. So, no specific Pokemon has any specific ID number. It is the trainer that gives the Pokemon the unique ID number.