Easiest way to get BP in HG?

What is the easiest way in HG to get BP? Is there a good team for that specific building in the Frontier?

Err, what is BP? I know HG must be Heart Gold, but what is BP? Big Pe- forget it.

in the battle frontier you win BP and you get more BP the better you do

I know but which building is the best for it? And BP means Battle Points from the Battle Frontier.

If you don't want to spend time training your own pokémon, just go to the Battle Factory.

http://bulbapedia.bulbagarden.net/wiki/Battle_Frontier_(Generation_IV)According to this Battle FActory is the best place to go. I'm still very disappointed in how hard it is to get BP. I'm saving up for Ice Punch and Im only on 15BP after like a week (casualy playing). Ice punch is either 48 or 64 BP, I can remember, either way being ridiculously high.