In doubles you're going to see a metric shitload of rain teams with equal amounts of goodstuff and Trick Room, in actual face to face competitions most teams are sand or goodstuff, with the occasional Trick Roomer.
If you're asking in terms of what kinds of pokemon you regularly see in doubles the big ones who you absolutely can not ignore because they're so common are Cresselia, Tyranitar, Hitmontop, Thundurus, Metagross, Hydreigon, Gastrodon, Garchomp, Lati@s, Politoed, Ludicolo. Those are the kings of VGC format who make up almost every team out there in some form. Out of those the absolutely most dangerous are Hitmontop & Thundurus, they make up one of the most dangerous lead pairs in the entire game.
Other Pokemon who are also extremely common and game changing you'll see are the likes of Scrafty, Whimsicott, Heatran, Chandelure, Excadrill, Abomasnow, Amoonguss, Togekiss, Terrakion, Breloom, Conkeldurr, Ferrothorn, Sableye, Gyarados, Jellicent and the Therians. Though in the case of the Therian's they're only uncommon because of the difficulty in getting them, in practice they'd have a lot more impact if they were easier to get.