5th Gen PWT difficulty

[DarkWolf13]

But they use legendaries, I don't know why, but having legendaries doesn't neccesarily make you the most powerful player. I used an uber legendary in the Unova Leaders and it was defeated somehow. And I don't find the Download Tourneys fun because I always face Garchomps, Metagross, Tyranitars, Hitmontops and the Kami trio.

 

[Griffinbane]

Here's the rules for the official Pokemon tournaments. In short, the only pokemon that are banned are non-trio legendary Pokemon, excluding Heatran and Cresselia. The Pokemon you've mentioned are common in VGC because they WORK. You can go onto Smogon and look up the VGC descriptions and it'll pretty much tell you why they're so good. The ones you've listed are often found on Sandstorm teams, and for good reason.