There isn't any control over them. Anybody can answer and are not even required to have Evs, natures ect. As said the most voted sets tend to be 3-4 years old. Some are older than B/W yet haven't been hidden yet. The fact that the sets are not updated similar to how Smogon does it means we end up with the mess that is moveset pages in which the only good current movesets tend to be hidden below 25 others gimmick answers.
As said above, if the answers were done by a couple of people and were updated every so often, the pages would have some significance. This isn't the case.