Apocalypse is an X-men villain, a mutant born thousands of years ago in Egypt. On top of that he has gotten his hands on a great deal of Alien technology. Aside from the fact that he has complete control of his molecules, allowing him pretty much any power he can make, he is telepathic and telekinetic. You would think that this is more than enough. It barely scratches the surface.
He is at least strong as The Hulk, and resistant enough to damage that all of X-Factor and the Inhumans couldn’t even slow him down. He can generate and absorb energy. This is tough because he can change his size and shape, so he can use his body into a variety of energy weapons. Oh yeah, he can plug into any technology, create matter and so forth.
Basically, he’s like an evil version of the Dos Equis guy.
Its an insane amount of power for one character, especially since Apocalypse likes to scheme and manipulate the X-men’s demise when he could actually just walk in the front door and wipe the floor with the whole school by himself.
Somehow he loses to the X-men consistently. I couldn’t even tell you why. I don’t think writers could either.