Current desired things you can buy with BP:
Vitamins
Pimp up your secret base
Choice items
BP moves
PVP box
Vitamins - I think they aren't that useful considering EV training is much easier now, you'd have to be really lazy to do this lol.
Secret base items - Generally, this is just one time buy so it probably doesn't require too much BP and that's if people even want a secret base. I know I do, but a lot of people don't.
Choice items - Right now, they'll be desired.. Give it