For money and level grinding, why not just do restaurant battles at Lumiose?
Go to the Le Wow restaurant and battle level 60+ Pokemon in a double battle for 100k+ profit in less than 10min.
Pay 90-100k (depending on your style rank), win 64k from trainers (With Amulet coin.), sell the 20-25 Balm Mushrooms you get for an extra 125k+.
I get about 100-ish mushrooms an hour.