Near Galaxy Hall, the merchant Ginter occasionally sells a random item at a fixed price. After buying an item, I can't buy from him again until he restocks with a different item.
How often does Ginter restock his items? Will he restock with a different item if I don't buy his current item?
11 Answer
According to Serebii:
2He will offer you an item for a short time, with it changing after you have captured 20 Pokémon.