Quick Money
One way is to buy a Coin Badge (A) if you don't have one. Equip it and go to Thwomp Volcano.
Go to the place where you find Gold Koopeleons. Battle them and defeat them with Bros. Items. At the end, you get 100-200 coins per Gold Koopeleon.
Another way is to get the Treasure Badge and defeat the Gold Koopeleons with Bros. Items. You should get some Golden Pants. Sell them to get a lot of coins.
If you need more help, we've got more Mario & Luigi: Partners in Time cheats and also check out all of the answers for this game
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