you go to prof. oak and he says,"Hmhm... You've caught 493 Pokemon so far...(name)! you've finally done it! You've finally competed the National Pokedex! This is better than meeting any exotic Pokemon for the first time! I feel blessed to have become friends with a Trainer like you! Sincerely, I thank you from the bottom of my heart!" And that is all.
What game version?
There is something different that happens in every game version.
It's just a guess, but in Pokémon Red and Pokémon Blue, you get a diploma from Prof. Oak. So It Might Be The Same.
when you catch all the Pokemon GO to the game editor in celadon city, and he will give you a certificate that says congratulations you beat the game"
There are actually a lot of questions under this topic...
Nothing really happens when you collect all the unowns... you just... have all the unowns!
Absolutely nothing.
go to ILEX FOREST and CELEBI will appear.
you'll get a shadow mew
nothing happens
Nothing.
nothing
nothing happens you just do it again i think.
You get a diploma and a gold trainer card.
You are stronger of cource by pecy Jackson
then you stop playing then you stop playing
you can't catch more pokemon. you have to get rid of some pokemon.
I dont know what happen in diamond, but in platinum you can catch ! and ? unowns.
The tunnel on top the ruins is accessible.The tunnel is where you catch the ? and ! Unown.
nothing will happen. you have to catch all the Pokemon to get something. you will get one of the johto starter Pokemon. YOUR WELCOME
you can get the Diploma from the guy in the Mansion in Celadon city.