User blog comment:Akrie/July 9th Events & Updates~!/@comment-61.247.54.161-20150713052454/@comment-26044650-20150713053117

You can go with Bright Cookie + Wishing Star for a 42% XP Bonus. Load her down with treasures that increases XP such as Chocolate Hardcover Workbook, Rose Life Ice Cream and Fatal Double Stick Icicle.

Make sure you use the Double XP bonus as well.