No, not really, based on the information provided about "Demon King" in relation to abilities like "The Ruler."
While Goku possesses immense power fueled by his Ki – his life force energy – the Demon King's described ability, "The Ruler," presents a significant challenge. This ability inverts attacks, effectively negating the impact of physical or energy-based assaults. Meliodas and Ban's Full Counter and Snatch abilities are cited as examples of attacks that are rendered useless against it.
Here's a breakdown:
- Goku's Strength: Relies heavily on Ki-based attacks and physical strength.
- Demon King's "The Ruler": Inverts attacks, regardless of their source.
Since Goku doesn't utilize magic, but instead relies on Ki, and the Demon King's power specifically counters attacks, Goku would have a hard time overcoming this specific form of defense. It's less about Goku's raw power and more about the type of counter the Demon King possesses.
Therefore, against a Demon King possessing "The Ruler" ability as described, Goku would likely not be able to win.