Lol. The sky was gray and rainy when I woke up and took Godot to work. We were both sleepy so it took a bit for us to notice that the song playing on the radio was ironically this.
Ok. The only solution is to send your saved file to the developer then he will fix for you.
Edit: the developer answered me for your question of rare candy: "No, there only is a Lesser Candy seller for in case your Pokémon get too powerful."