From the Super Mario Wiki
“Ever see Flimm the salesman? That guy sells some of the craziest stuff! It's great! He sells stuff underground, no matter whether that hole gets bigger or not. If you're interested, you should try to find him.”
Patch is a character in Super Paper Mario who lives in Flipside behind Saffron's restaurant. He is a window-shopper who goes to every shop in Flipside just to stare at the goods. Because he takes up space real buyers could use, shopkeepers always shudder whenever they hear him coming to the store. He seems to enjoy Flimm's store.