>>22256988For quick grinding you either use E4 or even better, Blissey Secret Bases. Pic related. With Level Release they're all Lv100 with Toxic Orb and Healing Wish. Use Exp. O-Power and Lucky Egg and you'll have Pokemon above Lv70 in no time.
For money, you can rebattle the Gentleman left to Lillycove. Happy Hour, Money Prize O-Power Lv3 and Amulet Coin gives you 120k per battle. You can battle him twice if you run around a bit and talk to him again before the timer runs out. There was also a method of using PayDay against bulky Pokemon without moves in Secret Bases but I haven't tested it yet.