Ash faced numerous Gym Leaders throughout his journey, so which one stood out as the toughest challenge in each region?

Be they nation-breakers, realm-conquerors, or world-enders, these fantasy anime villains are in a league of their own.

Goku from Dragon Ball is famously one of the strongest characters in all of anime; no matter how much the action rises in scale, Goku is one of the few characters whose power perfectly rises alongside ...