If you have a PS3 with firmware version 3.55 or lower, you can use an exploit like the "PS3HEN" (PS3 Homebrew Enabler) to install and play Tekken 6.
Before proceeding, ensure that you have a PS3 console with a compatible firmware version (3.55 or lower) and a PSN account. Download Tekken 6 Ps3 Pkg
Please exercise caution and consider seeking guidance from experts if you're unsure about any part of the process. If you have a PS3 with firmware version 3