Nothing happens except a large noise sounds in the distance. I think it's some dungeon opening but I still haven't found it. My friends can't either. If you want you can look for it but it won't be easy.
There is no dungeon but, If you have caught all of the Unowns then either Raikou/Entie/or Suicune has been released into the KANTO wild not the Sevii islands, and its not random on which legendary dog comes out. It all depends on your starter pokemon: Bulbasaur/Entie, Squirtle/Raikou, and finally Charmander/Suicune. This is the way to remember that helps me,"the weakness of my starter tells what legendary dog is going to be unleashed." I have done this twice so I know that I am right.
hope I helped.
you catch unowns just to fill out your unown notes. nothing happens when you catch all 28 of them including ! and ?
Answernothing happens apparently you just talk to the research guy and finish the side quest
I dont know what happen in diamond, but in platinum you can catch ! and ? unowns.
Nothing happens, except the fact that you have many Unowns. ~Katie
you get pregnant
The Tanoby Chambers open up so you can catch all the Unowns.
the ruin maniac guuy digs a new tunnel and new unowns come.
Mabey I have got all 28 Unknowns But nothing happens I thought you were supposed to get A Pokemon etc. Entei,Raikou,Suicune,Moltres, and zapdos.
you get celibi
by completing the puzzels in the ruins of alph
yes in solaceon
if you catch all 28 unknown, including the exclamation mark and question mark unowns, the unowns will spell the alphabet and question & exclamation mark unowns i really dont know what they do.