Mom, this is Ivy...Ten babes you shouldn't bring home to mom, and ten you should.
If you haven't yet challenged Jolene to a final duel, go and find her. Battle her a couple of times. You will be rewarded with a large red rupee (worth 200 rupees) each time you do. This is especially useful for buying all of the 1,000 rupee items at Beedle's and the Island Shops.