Big Poe

In Ocarina of Time, ten of these ghostly creatures haunt Hyrule Field. They only appear while you are riding Epona. When you spot one, it will run away so you must quickly defeat it with arrows. After being defeated, you can catch them in a bottle and sell them to the Poe salesman. If you sell all ten of them to him, you will be given an empty bottle.

In Majora's Mask, the Big Poe appears behind you and charges you with its lantern. Move out of the way and shoot it with arrows. Defeating the big poe at the Ikana Graveyard earns you an empty bottle, and defeating the one inside the Ikana well allows you to give its captured soul to a Gibdo to proceed.