A Link to the Past
A Link to the Past Popo are not much of a threat to Link as they are extremely easy to defeat. They will slowly move around the ground level, inching closer to Link. Link can defeat a Popo with almost any weapon, including just one slash from Link's Fighter's Sword.
Popo first appear in the Eastern Palace and then again within the Desert Palace. They later appear in the same corresponding locations within the Dark World. This being the Dark Palace and Misery Mire.