Phoebe was often considered the weakest of the Charmed Ones by demons due to her primary powers being more inclined to be passive than active.
However, she consistently proved them wrong with her formidable martial-arts skills and her remarkable spell-casting talent.
Fortunately, Phoebe eventually overcame all obstacles and passed her exams, allowing her to later graduate from college with a B. Unbeknownst to the sisters, Cole was a half-demon known as Belthazor who was sent by the Triad to kill the Charmed Ones.
Phoebe then cast the Dominus Trinus, which reawakened the powers of the three sisters that were previously bound by their Grams when they were children.
The next day, she received her first premonition—two teenagers getting hit by a car -- which allowed her to prevent accident, though it came at the cost of her being injured.
Phoebe was born on November 2nd, 1975 to the Warren witch Patty Halliwell and the mortal Victor Bennett.
On March 24th, 1975, Phoebe's birth power of premonition manifested itself through her mother while still in the womb, granting Patty a vision of the future.
Last but not least, Phoebe could access The Power of Three, the collective power of the Charmed Ones.