Originally posted by carthage
Magneto-Destroyed San Francisco, Sydney, was stated to have been capable of destroying everything built by humanity since the Bronze age, could lift stadiums, hurl metal without enough force to vaporize it, lifted the Golden gate bridge, stopped missiles well before his prime etc.
Phoenix-Lifted tons of water in the OT, disintegrated Apocalypse who was holding off all of Xmen/engaging Xavier in a telepathic battle (before she was aware of her power), matter manipulation, telekinesis, just a massive powerset
Legion-Could disintegrate armored troops, capable of freezing time/dragging minds to the astral plane, pyrokinesis, capable of engaging/stalemating a psychic entity that was fully aware of his powers while still learning of his potential.
Shadow King-Capable of freezing time, disintegrating soldiers with a gesture, transmutation, dragging minds to the Astral plane, telekinetically killing minds in the Astral plane, etc.
Professor Xavier-Currently the strongest telepath in the mythos capable of contacting 4.5 billion people (At the time of Apocalypse), could suppress Jean's animalistic Phoenix side in the (OT), defeated Shadow King in a telepathic battle at some point, was declared a weapon of Mass destruction at some point after DOFP
Apocalypse-Capable of lifting pyramids telekinetically, destroyed Cairo and reformed it as a pyramid with telekinesis, shields capable of repelling tons of metal, lightning/Cyclops optic blasts, teleportation, capable of transmutating individuals into the ground/forming objects like Magneto's helmet/morphing people into sand, could unlock the potential of mutants.
Sebastian Shaw-Absorbed the energy of an atomic bomb??, absorbed a grenade explosion etc. There might be some stuff I'm leaving out.
Quicksilver-Moved faster than an explosion that destroyed the Xmen mansion, different calcs for this and I honestly suck at math
But those are the mutants that stand out the most. We also have the Strucker Kids, Polaris, and the New mutants coming out which all might rank up there after their portrayals
And the Future Sentinels were so bad@ss that they nearly eliminated the entire mutant race from the face of the Earth...