Dragon Skin

Dragon Skin is a forgeable item in Golden Sun: The Lost Age. It is described as "Scaly dragon hide". It is found in various areas after the Great Western Sea is accessed, such as in SW Atteka Islet, and it can also be dropped rarely from a Winged Lizard in Yampi Desert Cave (fell it with Jupiter Djinn to increase drop rate by four times). Being an Artifact, it can be sold and later repurchased. It can be bought for 1200 coins and sold for 900 coins. It can be forged into the following moderately powerful armors:

Dragon Boots: Boot class: Defense +13: Venus resist +10: Mars resist +10: Mercury resist +10. It is bought for 4200 coins and sold for 3150 coins. The chance of it being forged is 15%. Dragon Helm: Helm class: Defense +42: Mars resist +20: Mercury resist +20. It is bought for 8900 coins and sold for 6675 coins. The chance of it being forged is 25%. Dragon Mail: Armor class: Defense +44: Mars resist +15: Mercury resist +15. It is bought for 9700 coins and sold for 7275 coins. The chance of it being forged is 20%. Dragon Robe: Robe class: Defense +42: Mars resist +18: Mercury resist +18. It is bought for 8900 coins and sold for 6675 coins. The chance of it being forged is 15%. Dragon Shield (Green): Shield class: Defense +42: Mars resist +15: Mercury resist +15. It is bought for 7400 coins and sold for 5550 coins. The chance of it being forged is 25%.

Locations

 * Anemos Sanctum: Cast Reveal by the front door. Walk through the first corridor to find the chest.
 * SW Atteka Islet: Push the pillar into the water to make stepping stones to reach the chest.

Analysis
Dragon Skin-forged equipment is most useful to the party in The Lost Age as soon as one individual item is found in SW Atteka Islet, accessible as soon as the Great Western Sea is accessed. Dragon Boots, however, have far more of an endgame appeal than the other items for being the best boots you can wear that are specifically defensive in nature.

RNG Method
Here is the RNG method for getting Dragon Skin. Dropped by Winged Lizard in Yampi Desert Cave. Standard rules apply. Attack order: Felix, Jenna, Sheba, Piers

Round 1
 * Felix casts Earthquake. Big arrow: Winged Lizard.
 * Jenna casts Beam. Big arrow: Winged Lizard.
 * Sheba casts Whirlwind. Big arrow: Other Enemy.
 * Piers casts Frost. Big arrow: Other Enemy.

Round 2
 * Felix casts Quake. Big arrow: Winged Lizard.
 * Jenna casts Beam. Big arrow: Other Enemy.
 * Sheba unleashes Whorl. Winged Lizard dies.
 * Piers attacks other enemy. It dies.

You got some Dragon Skin.