The date will probably be the date when you caught the Pokemon via Pal Park.
Nothing
It releases the Pokemon you have just caught =( sry
nothing............. you just caught all the Pokemon congratulations
when you are in the battle box summary or party it will have a symbol next to its name if it is pink it is a girl if it is blue it is a boy legendary Pokemon don't have genders and some Pokemon that are not legendary don't have genders
Nothing happens after that. You just caught the three legendary roaming Pokemon in the Johto Region.
it would be regular.
NOTHING HAPPENS
All you need is a good rod. I caught mine at Pastoria City in the pond but you can catch them other places too.AnswerRemoraid can be found by using a Super Rod on Routes 213 and 222 as well as in Sunyshore City, Pastoria city and the Pokemon League in both Pokemon Diamond and Pearl. Alternatively, it can be caught in Pokemon FireRed, Ruby, Sapphire or Emerald and transfered to Pokemon Diamond or Pearl via the Pal Park.
I have caught the 150 original Pokemon myself and all I got was some praise from Oak, but if you are talking about all on the national Pokedex, then I have no idea!
Tornadus cannot be caught in Pokemon white. He can only be caught in Pokemon Black, in the same way Thundurus is caught in Pokemon White.
You get a Diploma from the Gamefreak guys which say you have caught every Pokemon! (happens in all Generation Games) ... Pretty useless ... don't you think?
It does not gain any more EXP points and has max happiness unless it was caught at level 100. Nothing special.