You will get a different ending if you snap all 63 Pokemon
like the first, he will tell you of the terrific job you did, but the credits
screen will be different and will show the other Pokemon
pictures you took.
Sent in by Nathaniel Drury
Once you take Mew's amazing picture, Prof. Oak will ask to see you. There
he will tell you that he never even expected a pokemon like Mew to be on
the Island. The he will tell you did an excellent job and the credits will
roll. There in the credits you will see some of the pictures of the
Pokemon you took.