darkSpyro

Things you will Need....
Golden Queen Trapped (Works Better if Evolved)
Piggy Bank (Not Needed, But Recommend If you have more the 1 then this will work Better)
Sky Diamond (Not Needed, But Recommend If you have more the 1 then this will work Better)
Kaos Challenge Unlocked

1st You Get to wave 10 or up on Kaos Challenge then you get the Golden Queen and use her Secondary Attack Witch turns all Bad Guys into gold, and with the Skylander you want to get cash have him/her on the portal to collect the money, when you get to the "Build Phase" play as Your Skylander to recharge the Golden Queen. Piggy Bank is Useful too so he can get even more money for you and when your on the "Build Phase" Before you collect the money from Turrets and Chest Put The Sky Diamond On to get double the Cash

I will try this when I beat Golden Queen. I'll try this with L Blades.

If you have the piggy bank, you can head to chapter 7? I think it is, where you fight Eye Scream to capture her/him/it(?).
Wait for them to spawn a ton of eyeballs, and then plop the piggy bank on the portal. This will probably be even better with the golden queen trapped I'd wager, but I was rolling in the dough since Eye Scream will keep spawning eyeballs until you defeat her.