I usually never do video tutorials or shit like this, lol. But hey, I figured I'd share with the world.
This basically covers a way (thus far, first playthrough) to rack up BP and keep your weapons and stuff upgraded. You've got to be up to at least File R-04.
Right before the Mistral/Monsoon clone fight, there's a checkpoint. Spam the Plume de L'ange move with the Polearm on Mistral, and rack up a combo. The Plume de L'ange forces her into a block stun, leaving her unable to do much unless she gets off a hit first. It also makes quick work of the dwarf gekkos. Higher the combo, more BP. Kill her off, watch the BP rise, go customize, rinse and repeat.
If there's a better way, by all means, let me know. ^_^ Peace.