you cannot ever beat the battle tower. but if you have completed the sinnoh pokedex then the battle tower will help you complete it. you can battle at the battle tower as long as you want.
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There is no Battle Frontier in Pokemon Diamond and Pearl. Only the Battle Tower.
in the battle tower
to get bp (battle points) you have to beat people in the battle tower.
after you beat your rival at battle tower he will reappear every so often
He's another partner in the battle tower multi battle