There is so many things you can do after you beat the story mode.So many,in fact,that nobody else (as of now) has awnsered this question.I suggest buying the manual book.I was at barnes and noble shopping for books when i stumbled across the Pokemon black and white manual book.I looked through it and found a lot of fun stuff to do after beating the elite four.
P.S.I wrote some stuff down in it.xD
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Beat the pokemon league but they are the hardest to beat in the hole game hope I helpd
Prof. Junipers Lab
yes you can but you have to beat the game first once you do it should have something so you can transfer Pokemon from older games
you eather have to beat the game(the elite four) or use a walk threw walls cheat.
In pokemon white, unlike other pokemon games(well, except for pokemon black), doesn't give you a rod until the end of the game where you already beat N and ghetis and team plasma and other trainers in the game. Oh, you will ONLY receive one rod....which is the super rod!