That's your Trainer ID number, not a Pokedex number.
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Pokemon's ID is your Trainer Card ID!
What is the pokemon pearl ID?
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.
The ID number refers to the TRAINER who caught it, not the Pokemon itself. The ID is made up when you start a new game and is exclusive to you. Whenever you catch a Pokemon it will be given YOUR ID. If you trade with someone, however, that Pokemon will show you FRIEND's ID.
Pokemon have the same ID number as their origanal trainer.