Each time you eat one it will increase stamina bar will by 20%. You can unlock them in any order you like. Once you have them all it wold have doubled the amount of stamina you had at the beginning of the game.
- First Power Berry
Win the Beach Festival that takes place on the third day of Summer.
- Second Power Berry
- Third Power Berry
During the Spring or Fall seasons a horse race win the Carpenter's W.S. Cup
- Forth Power Berry
Reach the 100th floor of the mine and Tim will give you a berry.
- Fifth Power Berry
Donate a Pumpkin to the Pumpkin Festival.