The most reliable subtitle database on the internet (post-OpenSubtitles era) is Subscene (though it is in archival mode) and OpenSubtitles.org. Here are your best bets:
Option 1: OpenSubtitles.org
Option 2: YIFY Subtitles (for DVD Rip versions) polladhavan subtitles download link
Option 3: TamilMV & Subscene Archives (Requires VPN) The most reliable subtitle database on the internet
To avoid fake "download" buttons and malware: Option 2: YIFY Subtitles (for DVD Rip versions)
This is the largest, safest archive. They have multiple versions of Polladhavan.
Released in 2007, Polladhavan has had multiple DVD, Blu-ray, and streaming releases (including Sun NXT and YouTube). Each version has a different runtime and cutting, meaning a subtitle file for the DVD version will not sync with the YouTube version. The delay can range from 2 to 15 seconds.