No. The last Tekken game officially released for the PSP was Tekken 6 (2009) and Tekken: Dark Resurrection . Any website claiming "Tekken 7 PSP ISO" is either:
Some mods require enabling "Master Codes" in the Cheats menu to activate specific move sets.
Tekken 7 was never officially released for the PSP or PS Vita. It was released for PlayStation 4, Xbox One, and PC. Any "PSP version" available online is either a modified homebrew, a different game renamed, or a scam. This write-up explains how to play Tekken 7 content on Android via emulation of older titles.