What are the charmed episodes when phoebe turns evil?

In "Charmed," Phoebe turns evil in the episodes "A Witch's Tale" (Season 3, Episode 12) and "The Demon Who Came in from the Cold" (Season 4, Episode 1). In "A Witch's Tale," she is influenced by a dark spell that causes her to embrace her darker side. In "The Demon Who Came in from the Cold," she is manipulated by the demon, and her actions reflect her struggle with the temptation of evil. These episodes explore the duality of her character and the consequences of her choices.