Easy Coins. - Paper Mario: Sticker Star
To get lots of coins, these are the steps you need to follow:
1. Buy 15 shiny shell stickers.
2. Go to world 4-1.
3. Walk into all the shiny goombas you see.
4. When you are battling them, use the shiny shell stickers. You will get HEAPS of coins this way.
Added by: Matt77 May 18th 2013, ID#661