Where and what is the best way to grind money?

Where and what is the best way to grind money?

I already know how to grind Noko for exp, but the money you earn fighting her/him is very low. Now I'd like to know where is the best place to grind money the easiest or the most effectively. Does anyone know?
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Accepted Answer

KattsTheName answered: For me, if you're playing during the Post Game I'd say give a Yo-Kai the Ritzy Studs and bring a Noko along to the Infinite Inferno. Noko has the skill Good Fortune which increases the money you get after the battle and so do the Ritzy Studs.
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Answers

answer: Hmm, bug hunting and selling the bugs instead of trading them? Not sure as I haven't had a money problem issue since I hardly ever buy anything. Maybe Old Mansion or sewers for some decent earlish spots (I've only been playing about 17 hours and gotten my D Watch just recently so I don't have much knowledge of higher-level areas).
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answer I actually find that using the Yo-cam is very useful since one of the early rewards I got was a Golden Doll which is sold for $800.

answer I could have sworn that the golden dolls sold for $600?
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answer
  I just finished the quest to the yo kai world and did as much grinding there as possible, after about an hour I was up $2000. Battling in all the quest spots like the school, the hospital and so forth gave me a lot of money. I do recommend selling all the dolls you get.