The dynamo material is required in order to play the Cheekybeak Peak course after helping the golfers with their bird problem. The instructions the Cheekybeak Peak greenskeeper gives for where to acquire the dynamo material are pretty vague. This guide will show you how to get the dynamo material in Golf Story.
Leave Cheekybeak Peak and return to the world map. To the right of the entrance to Cheekybeak Peak is a disc golf course. Enter the course and you’ll find the three disc golf players.
Complete each of the challenges they give you — three in total — and you’ll be rewarded with the Dynamo Disc. Take this back to the greenskeeper in Cheekybeak Peak to complete the quest.