Cole Turner/Previous Powers

As Belthazor
As Belthazor, Cole is a demonic soldier of fortune. He is a powerful upper level demon with a high resistance to damage and was immortal. Vanquishing him required a potion which needed a piece of his own flesh. He can shimmer, throw energy balls, conjure Athame's and possesses super human strength, Spell Casting, and Sensing. He also possessed Adjusting, Telekinesis and Pyrokinesis, but was only seen using them once or twice, prompting some speculation that he was stripped of some of his powers after renouncing his demonic legacy.

As The Source of All Evil
Cole eventually becomes The Source of All Evil, and as seen possessed most or likely all of the powers of the Source, including flaming, Immunity, Sensing, Fireballs, Regeneration, Force Fields, Electrokinesis, Pyrokinesis, Shapeshifting, Telekinesis, Summoning, Mind Control, Possession, Conjuring, Molecular Manipulation, and Demonic Projection. After his coronation, he gained several more powers, though it was never made clear what other powers he picked up since he was vanquished only a week later.

Return from Wasteland
During his time in the Demonic Wasteland, Cole learns that the serpent beast of the Wasteland feeds on the powers of Vanquished Demons. In taking the powers before the serpent is able to, he eventually defeats the serpent, or at least destroys parts of it, making him able to obtain whatever powers are available. He eventually acquires a massive arsenal of demonic powers and escapes the wasteland.

It was never established how many powers Cole acquired, since he returned from the Wasteland 72 hours after Phoebe went there. However, Phoebe later said that Cole had more powers than any demon she'd faced at the time, making it very likely he returned to the Wasteland to get more. This makes it likely Cole had hundreds or even thousands of powers. However, he is only seen using about 24 powers on-screen-- Fading, Molecular Immobilization, casting Energy Balls, and Fireballs, High Resistance, Telekinesis, Pyrokinesis, Force Fields, Shapeshifting, Regeneration, Reconstitution, Conjuring, Mind Control, Summoning,Transformation, Demonic Projection, Molecular Manipulation, Chrono-Telekinesis, Sensing, Invincibility, Immortality, Pressurization, Temporal Stasis and Power Granting as he could grant any of the powers he had to others for a time. Due to the massive amount of powers he absorbed, his blood turned acidic.

Unfortunately for Cole, since he was fully mortal by this time, the massive weight of these powers had slowly started to drive him insane. Shortly afterward, despite his efforts to fight the evil growing in him, he turned completely evil.

As Avatar
As an Avatar, Cole possessed the ability of Reality Warping. Given the nature of a Avatar powers, however, we can conclude that Cole's powers were virtually unlimited, and included, but were not limited to, Energy Waves, Spell Casting, Immortality, Invincibility, Lightning bolts, Fire Throwing, Aerokinesis power containing, the ability to create Illusions, Chronokinesis, Summoning, Sensing, the ability to remove people from existence, Resurrection, Regeneration, Molecular Manipulation, teleportation, and time travel. However, when he changes reality to be with Phoebe, he loses his Avatar powers, and reverts to his former form of Belthazor.

In the Cosmic Void
In the Cosmic Void where he was banished to by the Charmed Ones, Cole was shown to still possess a few powers. He is neither ghost or demon, it still remains unsure what he exactly is. He could teleport himself with a grey sparkling-like power and could move in the blink of an eye without blinking. He could communicate with beings on other planes like the Thorn Demons, could make any kind of deals with Demons, and still had a connection with Phoebe. When she walked passed him, he was looking at her and Phoebe could feel something but ignored the feeling. We can assume that he still might have some or all of his Powers and as he is alive is watching over them in secret.

Temporary Abilities
In the episode Look Who's Barking, in an effort to suppress his human-half, Cole had his blood transmuted with an alchemists. Under the Alchemists spell, Cole became immune to witches powers after Piper attempted to vanquish him with a potion. Although he received additional protection, he did not seek out the alchemist again since Phoebe used a potion on him that returned him to good.

He also acquired the power of the nexus in The Importance of Being Phoebe in an attempt to turn Phoebe and regain control of the Underworld. Before he could use any of his new abilities, Phoebe cast a spell that returned the nexus to it's resting place under the Halliwell Manor.