Nothing is known about what happens after achieving capture of all 26 Unknowns. Sorry to disappoint.
nothing
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.
no
the fun of having them i guess
you have beaten the game and that's it.
NOTHING HAPPENS
I think it is on Seven Island (may be wrong) Go to the ruins. In the caves have Unknown.
you be come the Pokemon master
you can get certificate from the gamemakers by going to the celdon mansion
You go to professor britch and he gives the fire red starters
No, just Unown.
well the unown letters can beat the elite four if you get all of them that's automatic power