Originally Answered: Why is Rey so overpowered in Star Wars Last Jedi? She is the only one that does what she does with ZERO training. No one else is 100 percent completely untrained. Her power comes from where Luke says it does.

Why is Rey so powerful?

Rey is Palpatine's Grandaughter

But like Anakin, Luke, and Kylo Ren, Rey has the advantage of an amazingly Force-sensitive bloodline; her direct relation to Emperor Palpatine, easily one of the strongest characters in the franchise, explains her innate potential.

Is Rey the strongest ever?

Canonically, Rey is indeed the strongest Jedi. Her dyad is stronger than the Force of Life, and by the end of Episode IX, she can heal mortal wounds—a feat reserved for the elite of the elite. Rey is also said to possess the Force of every Jedi before her. “Every Jedi who's ever lived lives within you.”