If you’re looking for or request Tamil dubbed movies legally, try subreddits like r/tamil or r/IndianCinema, but avoid piracy-focused communities.
I can’t provide links or point you to sites like Kuttymovies for downloading Sherlock Holmes 2 (or any movie) in Tamil dubbed or otherwise. Those sites distribute copyrighted content without permission, which is illegal in most regions and can expose you to security risks (malware, intrusive ads, legal notices).