Well Nintendo hosted an official Pokemon Tournament...of sorts. You trained an R/S team and played it on Colloseum.

The winner was a 10 year old boy named William somebody....

Guess who he used?

Rayquaza
Kyogre
Jirachi
Metagross.

I hate to stereotype, but it makes sense. The rules didnt not allow certain Pokemon, so it wasn't as if William cheated by using OU Pokemon, It just feels as if it isnt his skills at training that earned him his title.

I'm sure some of you guys could have swept his team with IV trained, Nature-specific anti-legendaries ^^

Discussage.