You Have To Do Every Gym ANd Then Get To The Elite Four And Do The Champion. If You Want To Complete It 100% Then Get Every Single Pokemon Aswell(:
you get to fight ash, but he apears as pokemon trainer red.
At N's castle
There won't be any old Pokemon on Pokemon black and white until you finish the main quest.
You cannot transfer pokemon from HeartGold to Black until after you finish the main part of Black. Do note that you will be transferring pokemon from HeartGold to Black, not trading pokemon between the games.
you never really truly finish the game. but you would probably need to finish your national dex, beat the league, beat Cynthia, battle every trainer, and do all events involving Pokemon black (that inclueds the ones Pokemon.com hosts to.)
Yes.... it's possible i did it with Pokemon platinum... so it's possible with Pokemon black/white too..
Yes they are, once you finish the main story and get the national Dex, you can find lower generation Pokemon
u have to make it to finish Laval 20
finish the game and go to every house and talk to everyone
go to undella and fight Cynthia or finish the pokedex
No you can't trade with black to diamond but you can trade from diamond to black using the poketransfer lab. (you will have to have beaten the game before you can use the poketransfer lab). Hope I helped this is luke127 signing off.
finish the pokemon league