View All Entries in the Pokedex
After completing the Pokedex by catching all 150 Pokemon, the entries for all 150 are available for viewing. Each entry provides the Pokemon's picture, type, height, weight and a brief description.
Congratulations from Professor Oak
After catching all 150 Pokemon, you can speak with Professor Oak in Pallet Town at his laboratory, which is located just southeast of your house. He will then congratulate you on the completion of your Pokedex.
Congratulations and Certificate from Game Freak Team Member
A member of the Game Freak development team is in the back of the first room on the second floor of the Game Freak building in Celadon City. The Game Freak building is the tall building to the left of the Celadon City Pokemon Center. Upon speaking to the development team member, he will congratulate you and show you a certificate recognizing your Pokedex's completion.
Print the Diploma
If you have a Game Boy Printer, you can print out a physical copy of the Pokedex completion diploma presented by the development team member. This feature is available only in "Pokemon Yellow" but not in "Pokemon Blue" or "Pokemon Red."