no
They keep getting stronger each time you challenge them. at least that's what They do in Pokemon black.
no only once
Simple. You just battle the elite four again and you can challenge him
Do you mean reshiram?if you do when you are on N's final battle in your first Pokemon league challenge,your light stone summons reshiram you have to catch it.
battle wild pokemon until yours is lvl18+
The Champion in Pokemon Black and White is only after you have defeated N and Ghetsis For the final time. Then the second time you battle the Elite Four/Pokemon League, You will battle Champion Alder. All his Pokemon are Lv 75.
You cannot battle between a Pokemon Black game and a Pokemon Soulsilver game.
Yes, you can challenge Champion Adeku (his Japanese name) after you defeat N. In Black and White, you also get the opportunity to battle Cynthia, but a warning-- she's a lot harder to beat.
As happens in any other battle you black out. lose some money and end up back at the nearest Pokemon centre. Your challenge will have to be restarted.
No.
You Battle Her At Undella Town/City She Has The Same Pokemon As In The Last Game And Shes In The 2Nd House From The PokeCenter She Talks About The Abyssal Ruins =) Hope This Helps!!
No, but you can import Platinum Pokemon to Black.