I wouldn't say its a disadvantage, so much as just another level to the battle. Both players get to see the other team, so its even. And many pokemon run different sets in battle, so you don't know the opponents team 100%. As I said above, it really only hurts lead pokemon like Azelf, Machamp (though he suffers from Conkeldurr usage) etc.
Huh. That's odd. I guess it's only fair, though; we've been doing it to Gym Leaders and other in-game Trainers via Bulbapedia and other sites pretty much since the internet was invented, so it's only fair that we have to face that particular disadvantage ourselves...
In other news, I just won a Battle Factory-style thing in the Battle Tent at Slateport. My rental team: Breloom, Golbat, Electrike.
Psst. fixed your quote formatting.
