Once you get every unknown, another section of your pokedex will be added. This contains other Pokemon that can not be caught in fire red or leaf green.
All the letters plus the new's "!" and "?".
nothing happens
It is said that when you get all unknown you will get something i think a pokemon but i am not sure
nothing happens unfortunetly
From Diamond/Pearl: Simply trade them from your old game. From Ruby/Saphire/Emerald/FireRed/LeafGreen: You'll need to earn the national pokedex by seeing all the Poekmon in Sinnoh (usually by battling everyone), then talking to Professor Rowan.
you can get the Diploma from the guy in the Mansion in Celadon city.
Nothing prof oak thanks you and that's it.
they spell the alphabet and maybe you get a rare Pokemon
i think so but im not sure i caught all of them in the cave
Congrats for first second go to prof oak just watch what happens it will scare you.
go to the underground part of ruins of alph. you'll run into them if you run around.
Nothing special. They just spell out the alphabet, maybe you get a rare pokemon (;