Quick question. How do I receive the 50BP for entering the competition? Also is it safe to remove my team from the battle box?
I don't know about the first one, but it is safe to remove and replace Pokémon from your battle box between battles. I don't play competitively very often, but I know that the battle box works just like your party, except you can't change their items, order, etc. You can use them for battles and alter them as you please.