(Japanese: ヨサク Yosaku) is a one-time character from the Pokémon anime who appeared in A Farfetch'd Tale.
Living in the Ilex Forest, Yosaku makes Charcoal and provides it to Trainers who are passing through. He is helped out by Sylvester, who attempted to seek Yosaku's help when his Farfetch'd refused to listen to him. However, Yosaku simply told Sylvester that he should find and train the Farfetch'd on his own.
He was also seen giving a large amount of Charcoal to Ash and his friends after they had saved Sylvester's Farfetch'd and helped Sylvester to command it correctly.