User blog comment:Richard Starkey/Rayquaza Vs. Alduin/@comment-5790624-20120813093044

I believe Alduin has this. He is the world-eater after all. Alduin was capable of defeating some of the finest and most skilled nordic warriors on the throat of the world and was only beaten due to the fact that the nords used an Elder Scroll to cast him into to time and to another time period. Alduin has access to the powerful and ancient dragon language and shouts, these include devastatling powerful fire attacks, a meteor strom that if hit Rayquaza, would likely knock him or stagger him, and multiple frost and fire breath attacks. In addition to his dragon shouts, Alduin can utilise his powerful tail to knock or stab enemies and his strong bite. Alduin partisipated in the lengthy war where he would of likely encountered countless enemies, including traitor dragons. Another important fact is that Alduin can't die in the mortal world due to his sheer power.

Overall, I believe Alduin has the power and capability with experience to defeat Rayquaza.