Serebii and all these sites have the information because they're playing on a ROM that someone leaked out. Well the opinion that Garchomp is broken has been circulating around since a year ago or two ago, when DP was first released in Japan. Now it's finally being moved to Ubers, though I still think Rayquaza would be more prefered over him in that tier. But Ray lacks SD and has only Dragon Dance, which still is a very powerful move on him. It'll be really interesting to see how people respond to Salamence and Gyarados' Outrage. Hey, did Snorlax get Slack Off?