Have a page that spits the IP/hostname of referrer in a hidden section. Using that you can identify the IP/hostnames, so if he changes, you can always detect it.
Now that you can detect him, when he crawls your site, feed him garbage info for every single page, then constantly check his page for the hidden ip/hash in case he changes his IP/host. Hide that in a minified js. You can also feed his page bogus links that violates google's SEO so he can get blacklisted.
Have a page that spits the IP/hostname of referrer in a hidden section. Using that you can identify the IP/hostnames, so if he changes, you can always detect it.
Now that you can detect him, when he crawls your site, feed him garbage info for every single page, then constantly check his page for the hidden ip/hash in case he changes his IP/host. Hide that in a minified js. You can also feed his page bogus links that violates google's SEO so he can get blacklisted.