Especially if he is paired up with Ninetales, one of his big weaknesses is Stealth rock, something that is almost worthless in anything that isn't Singles and sometimes doubles.
His flying type actually comes in handy when it allows him to avoid earthquake, plus 4X weakness to rock type moves doesn't really matter since he probably would be KO by those type of moves even without the extra weakness.
The only two pokemon that have the same typing is moltres and Ho-oh, one being an uber and the other out classing Charizard if you don't mind the lack of dragon moves.
But alas, it seems that people only play singles, which means a lot of pokemon become useless.
Gamefaqs in a nutshell (http://error1355.com/img/gif/gamefaqscant.gif)
I preferred Rock Slide since it won't hit my partners. Only exception is Surf thanks to my Gastrodon, who in turn hits with high powered Blizzards. Plus there's no chance of something being immune to Rock Slide.
However history remembers me, it shall only remember a fraction of the truth.