I was watching a ProtoMario video about his theory that the meteor, asteroid, whatever, was no threat, and quickly debunked his theory and my results were quite mindblowing and I'm sure a lot of you can appreciate these finds. Steven Stone's father states that the asteroid is 6 miles wide, this source here (Asteroid Impact That Killed the Dinosaurs: New Evidence | Chicxulub Crater) states that an object that large hitting the earth would create an explosion as powerful as 100 trillion tons of TNT, which is 100 billion kilotons of TNT, which is much stronger than the most powerful nuclear object currently in existence, the Tsar Bomba, which is about 100,000 kilotons of TNT. Now, using a nuke map simulator here: NUKEMAP (Classic) by Alex Wellerstein you can enter in 100 billion kilotons for a theoretical nuke of equivalent power to that asteroid. The results are, simply put, amazing.
From this image here, you have five circles that represent an effect, the green circle is heavy radiation, and you can read what it does on the image or on the website, that encircles most of Hoenn's major island, all of Hoenn, Johto, and most of Kanto gets hit by the actual fireball, the strong airblast that follows hits the rest of Kanto that wasn't hit. A weaker, but still deadly airblast moves up into Sinnoh, and the last circle, which is thermal radiation, is so large, it actually comes back around to create a small circle near South America which is the only area NOT affected by this at all, Unova and Kalos would experience thermal radiation.
Fun Fact: Guyana, the supposed birth place of Mew, was just outside of the unaffected circle by maybe 1,000 miles.
So yeah, it's a good thing Rayquaza complied and destroyed it.
To put it simply, it doesn't matter if it's an asteroid or a nuke, something that powerful would essentially destroy the planet.