While we can trust answers that are the users own experience, when numbers are involved there are few reliable sites.
Perhaps we have a list of "approved sites" that can be used as a source. Examples would be: bulbapedia, serebii, smogon, marriland, this site. More could of course be included.
Now these sites aren't always correct (I ever tell you about the time bulbapedia actually posted a fake equation I made up to prove a point on one of their articles? Then there was the time I lost a tournament due to false information on bulbapedia.) However, these sites are far more reliable than some random place on the internet.
Sites that aren't on the approved list of sites could still help in getting the correct answer. And nobody would be forced to allow just these sites. But it would help make sure that skepitcal users such as myself get more reliable answers. Call it a guideline.