The legal way to obtain a RAP file is to dump it from your own PS3 console after purchasing the game legally from the PlayStation Store. While many archives exist online, downloading licenses for games you do not own falls into the category of piracy. We recommend using your own backups to keep your emulation journey 100% legal.
It is also possible you are looking for the music itself. Tekken 6 is famous for its aggressive electronic, rock, and hip-hop soundtrack. tekken 6 rap file
require a .rap file. Most players recommend using the ISO format for The legal way to obtain a RAP file