Hello!
I'd like to attempt to persuade my eager, budding, and undoubtedly intelligent Ubers players to really exert their logic circuits and their common sense mains. When playing this game take a moment to concern not only which Pokemon go where, but also the pick order.
Of course, I am convinced that the more cunning of you have recognized the value of picking later as opposed to earlier. Picking Pokemon that influence team style is generally a bad idea, weather summoners, Pokemon with hard counters, niche counters, I advise against picking all of these earlier. The reason being that you want to bait the opposing team into making the least good pick possible; showing your big guns at the start encourages counter picks to your strongest and most integral Pokemon, something you definitely do not want.
In the case of Hippowdon being an early pick, standard sand has trouble with a few Pokemon, and has an easy time with a lot of others. I could very well be a wily wormwood and shut my mouth until team 1's last pick and smack on a Fighting or Water Arceus, which sand teams are typically weak to. There are more options: I could use Jolly Balloon Excadrill, Choice Specs Kyogre, etc. Furthermore, now team 1 will never use Ho-Oh, a Pokemon sand teams typically have little trouble with.
The inflexibility and transparency of revealing full sets in addition to the Pokemon make this a different ballgame for the less astute. Pick discreetly, with the intention to bait, befoul, bludgeon, barf upon, and generally bring waste to the opposition.