Don't wanna be flat out argumentative but it's really not that bad. Grab one of your strong pokes, get 5 pickupers to level, head over to the Battle Chateau and send out whatever you can from Silver/Gold/Black writs. Use O-Powers when you can for Exp or Money.It's a bit of work getting so many Pokemon to Lv81 though.
If you can send out Black Writs you can really rake it in.