Medal

Medals are items featured in SS undefined. Each medal gives Link various enhancements when equipped in the Adventure Pouch. They are usually found in Goddess Chests, or can be purchased from Beedle after some Wallet upgrades.

Life Medal
The Life Medal acts as a Heart Container, but takes up one space in the Adventure Pouch. It can be purchased from Beedle's Air Shop for 800 Rupees. Another can be found in a Goddess Chest northwest of Fun Fun Island, allowing Link's total hearts to reach a maximum of twenty.

Bug Medal
The Bug Medal reveals the locations of bugs on the map. It can be purchased from Beedle's Air Shop for 1,000 Rupees.

Heart Medal
The Heart Medal causes hearts to appear more often. This is also the only object that causes hearts to appear and heart flowers to bloom in Hero Mode. There are two of these to be found, both from activating Goddess Cubes and opening their corresponding chests.

Rupee Medal
The Rupee Medal causes Rupees to appear more frequently. It can be found in a Goddess Chest in the northern part of the Thunderhead, and also in one on Beedle's Island.

Treasure Medal
The Treasure Medal increases the frequency of finding treasure. It can be found in a Goddess Chest southeast of Beedle's Island in The Sky.

Potion Medal
The Potion Medal causes the effects of potions such as the Guardian Potion to last longer. It can be found in a Goddess Chest far to the west of Skyloft.

Cursed Medal
The Cursed Medal increases the frequency of finding Rupees and treasure, but it disables the use of the pouch. This means Link cannot use potions, bottles or any shields. However, items that do not need to be equipped, like Bomb Bags and Medals, will continue functioning. The medal can be obtained by giving Batreaux thirty Gratitude Crystals.

See here for the translations of each medal.