The answer is 0.You need to see every Pokemon to get to the volcano
The Battle Tower
The Pokemon you see do not go in your pokedex.
Believe in your pokemon... and take the wifi battle tower challenge!
The Battle Tower is on a separate island in Pokemon Emerald of which you can only get to by boat and the island is only accessible as a post-game option meaning after you defeat the Elite 4 and the Champion.
Get a 48 wining streak.
There is no Battle Frontier in Pokemon Diamond and Pearl. Only the Battle Tower.
after you battle 7 trainers in the battle tower you will get 3bp
The Battle Tower
in fight area
in the battle tower
battle tower
You have to win 100 battles in the battle tower
At the fight area (after you beat the Pokemon league)
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.
The Pokemon you see do not go in your pokedex.
to get bp (battle points) you have to beat people in the battle tower.
you can get it by exchanging battle points at the battle tower. Enjoy =]