The Legend of Zelda: Oracle of Seasons/Golden Monsters

It is said that a mysterious gold-cloaked sage resides somewhere in Holodrum, and has made the monsters appear. He eagerly awaits a person worthy of his treasure, and knows when each of his monsters have been slain. If you feel up to his challenge, then it's time to hunt the Golden Beasts!

Golden Beast #1: Golden Darknut
Requirements This monster can be found east of the Heroes Cave(You must have the pirate ship "parked" in between the two bridge parts to be able to get to the stump).
 * Obtain the Power of Spring

Golden Beast #2: Golden Octorok
Requirements Enter the far southwestern corner of Spool Swamp to find another Golden Beast, the Golden Octorok, an Octorok that shoots chunks of pure gold. This one will be rather tricky to defeat, because you can't knock it down a hole. Instead, you must tackle it the hard way with your sword. When it's gone, that's two down!
 * Obtain the Power of Summer

Golden Beast #3: Golden Moblin
Requirements
 * Obtain the Power of Fall

Head back over to the entrance of Snakes Remains and make it fall(You must enter Snakes Remains to make it fall). You'll find a Moblin has appeared, except he's gold! He is one of the four Golden Beasts, and is incredibly tough to battle. If you have low-level items, it will be a long, grueling fight.

It will take a lot of sword strikes to defeat him. When you do, he will disappear for good. Now, for the next one!

Golden Beast #4: Golden Lynel
Requirements Can be found in Tarm Ruins during Winter.
 * Obtain the Power of Winter

After you've killed all four of the Golden Beasts, head back to the sage to collect your reward, the Red Ring, a ring that doubles sword damage without increasing the enemy's health.