The gift of knowing you caught them all, but really, I have caught them all on: Silver, Leafgreen, and Diamond; and nthing happens. Do NOT believe anything other people say, there is nothing special if you catch them all; In fact, if you catch every Pokemon, all you get is a dumb paper!!!
in Pokemon diomand&pearl you unlock a cave in route 214 which was blocked off more info serebii and poke.marriland
i don't know in other games, but in the original silver if you caught all of them you could use this printer machine that, in combination of the camera/printer tool that attached to the original game boy color, could take and print special pictures featuring the unknown as a border or something, yea that is lame, but it is something
-Maximus Prime3
Chat with our AI personalities
you can read the unknown and you unlock ? and ! unknown
You have to do all of the puzzles first, then you can get all of the unknown.
Catch 'em all
You can not catch any of them in black or white, but I think that you can catch all 3 in diamond.
you can catch water Pokemon by surfing on water and by using all the rods