Dr. Troy is a character living within his own Home in Oracle of Ages. He resides in the north-west corner of Lynna City, just north of the Know-It-All Birds' Hut. Dr. Troy is an expert on many different creatures found throughout Labrynna. He often shares this information with Link to help him throughout his quest.
After defeating Veran, but before going on to Holodrum, Link can find Dr. Troy at Rolling Ridge's Target Carts mini-game. For getting a perfect score, Troy rewards Link with some Bombchus.