Spoilers - do not highlight unless you want them. Quick and easy money - post game.
Go to restaurant Le Wow. Have Amulet coin on your first pokemon, and activate prize money O-power RIGHT before you talk to the person who seats you. It cost 100k to dine, but the first two fights nets you OVER 120k if you have level 3 O-Power. The rest is just icing on the cake. Plus if you do good, you get Balm Mushrooms to sell after. I am up to over 3.5 million and really have not put much effort in. Constant battling there (with your O-power) will net a hefty sum
Go to restaurant Le Wow. Have Amulet coin on your first pokemon, and activate prize money O-power RIGHT before you talk to the person who seats you. It cost 100k to dine, but the first two fights nets you OVER 120k if you have level 3 O-Power. The rest is just icing on the cake. Plus if you do good, you get Balm Mushrooms to sell after. I am up to over 3.5 million and really have not put much effort in. Constant battling there (with your O-power) will net a hefty sum

. I will have access to Black 2 and X before long, but not sure it can be transferred with one system. Got a free month of Gamefly so using it as much as I can
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