Surprisingly, Android 17 outlasted every fighter and became the last man standing when Goku and Frieza sacrificed themselves to take down Jiren. Thanks to 17’s resilience, Universe 7 won the Tournament of Power.

How did Android 17 become so powerful?

Android 17 was so powerful in Super for nearly the same reason that when Frieza and even Fat Buu trained they got a massive power boost. Their base is already massive without any training.

How did Android 17 become Super 17?

Android 18 attacks Android 17, though he overwhelms her as she blocks an attack intended for her daughter Marron. Android 17 departs to meet his copy and the two fuse to form Super 17, defeating the heroes and under orders from Dr. Myuu, kills Dr. Gero again.