Old Man Tsubo

Old Man Shuckle is a character of the day who appeared in A Better Pill to Swallow (EP172).

He is a maker of Shuckle juice, owning many bottles of it. He makes use of the many wild Shuckle in the area where he lives. He produces medicines from the Shuckle juice, one of which was used to cure Ash's indigestion when they first met. Old Man Shuckle promised to teach his recipes to Brock if the group caught a Shiny Shuckle for him but Brock eventually decided against using man-made products as a Pokémon Breeder.

However, Old Man Shuckle also plays up his actual renown: while Ash and Brock were amazed at the beams of light that appeared when he spoke about himself, Misty easily noticed that the light was actually coming from a flashlight the man was holding behind his back.

(Source: Bulbapedia)