To be honest with ya i am not sure.
you have to trade it with pkmn diamond
it doesnt show it in pkmn diamond, but in pkmn pearl
Yes.
in the hall of origin
action replay
You train.
Yes you can, but only by migrating it from Pkmn Ruby/Sapphire/Emerald.You can migrate Pkmn by unloking the Pal Park after you complete the Sinnoh Pokedex.
Unown is number 114 in diamond pokedex hope it helped
No, there is not a Pokedex after the National Pokedex in Pokemon Diamond Version.
diamond pokedex number 80 is Barboach
press switch pokedex on the national pokedex and you will be using the sinnoh pokedex
you cant....................... but you can if you get pkmn diamond or pearl