From the Super Mario Wiki
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Charlieton is a traveling salesman encountered in the game Paper Mario: The Thousand-Year Door. He appears to have a knack for ripping people off, much like Rip Cheato; his name is even a pun on 'charlatan' (a swindler).
He sells items and Badges in the Rogueport Plaza. Most of his items and Badges are fairly rare, and he is the only way for Mario to complete his Badge collection. His prices are also high, but Jammin' Jellies and Ultra Shrooms are sold at 120 coins each, their cheapest price in the game. Charlieton's inventory cycles and changes from day to day depending on the clock on the Nintendo Gamecube and/or the player's progress. Therefore, all items that he sells can theoretically be obtained at any given point in the game, meaning that while certain items may not appear for a while, they may eventually reappear.
If Mario buys all the things available, he will thank Mario for putting his kids through college.
Charlieton also has a chance to appear on every tenth floor except the 100th in the Pit of 100 Trials, selling common items such as Mushrooms at an inflated price. The prices are higher the deeper Mario is in the Pit.
Items on sale
Here is a list of the items that can be purchased from Charlieton.
Names in other languages