It has been a not uncommon occurance that trojans piggyback off of the ads that are on the sites here. If you get the specific ads, you get the virus. However, the ads are randomWell, TVTropes has a big massive warning on its Pokemon page: http://tvtropes.org/pmwiki/pmwiki.php/Main/Ptitlei015gc004kw4?from=Main.Pokemon
I've visited the site a few times within the last two days, nothing happened to me though.