Counterattack site that´s hacking web search results

A friend of mine which I´m working with has a business in UK, he wants to hire a hacker to counterattack a player who´s hijacking websites to cheat on search engines ranks. Using these injections, he´s now #1 in google search at uk. We need to get him out of google first 2 pages at least, find a way to instruct some websites who were hijacked, to simply clean up his code, and promote our website in a similar way. We have no idea on budget, but we´ll pay him well if things are professionally done.