What exactly are you searching for and where? If you are using http://pokemondb.net/search there are sometimes adverts at the top and right of the results. Don't think I can change that, sorry.
But if you let me know the URL of the sites that are appearing I'll see if I can block them or anything. I already blocked a lot of dodgy ads for things like "interracial gay dating" (seriously, do services for this specific purpose really exist?!) that were targeted at our "black and white" pages ಠ_ಠ