How do I get more money?

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In the early stages of the game, sell all fresh Apples you can! After having an Apple for longer than a day, it won't be fresh anymore. If you sell it while it's fresh (indicated by a little sparkly), you get 100 Poké for it. (That's a great amount early game.) Many players collect all the Apples they can, sell them while they're fresh, and buy non-fresh Apples from Kecleon, for much cheaper, to actually eat.
In later stages of the game, I've heard selling Gold Bars is a good way to get lots of money, but I haven't looked into it and don't know for sure if selling them is really worth it.
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