It is only legal to download an ISO if you physically own the original game disc and rip it yourself (for backup purposes). Downloading a game from the internet that you do not own is piracy.
This is the most common misconception in the fighting game community. Download Tekken 6 Ps2 File Iso
For those interested in playing Tekken 6, there are several legal alternatives: It is only legal to download an ISO
If you are looking to play Tekken 6 via emulation, you have three primary options: you have three primary options: